// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2008-2009 Texas Instruments Inc
 *
 * Driver name : VPFE Capture driver
 *    VPFE Capture driver allows applications to capture and stream video
 *    frames on DaVinci SoCs (DM6446, DM355 etc) from a YUV source such as
 *    TVP5146 or  Raw Bayer RGB image data from an image sensor
 *    such as Microns' MT9T001, MT9T031 etc.
 *
 *    These SoCs have, in common, a Video Processing Subsystem (VPSS) that
 *    consists of a Video Processing Front End (VPFE) for capturing
 *    video/raw image data and Video Processing Back End (VPBE) for displaying
 *    YUV data through an in-built analog encoder or Digital LCD port. This
 *    driver is for capture through VPFE. A typical EVM using these SoCs have
 *    following high level configuration.
 *
 *    decoder(TVP5146/          YUV/
 *           MT9T001)   -->  Raw Bayer RGB ---> MUX -> VPFE (CCDC/ISIF)
 *                              data input              |      |
 *                                                      V      |
 *                                                    SDRAM    |
 *                                                             V
 *                                                         Image Processor
 *                                                             |
 *                                                             V
 *                                                           SDRAM
 *    The data flow happens from a decoder connected to the VPFE over a
 *    YUV embedded (BT.656/BT.1120) or separate sync or raw bayer rgb interface
 *    and to the input of VPFE through an optional MUX (if more inputs are
 *    to be interfaced on the EVM). The input data is first passed through
 *    CCDC (CCD Controller, a.k.a Image Sensor Interface, ISIF). The CCDC
 *    does very little or no processing on YUV data and does pre-process Raw
 *    Bayer RGB data through modules such as Defect Pixel Correction (DFC)
 *    Color Space Conversion (CSC), data gain/offset etc. After this, data
 *    can be written to SDRAM or can be connected to the image processing
 *    block such as IPIPE (on DM355 only).
 *
 *    Features supported
 *              - MMAP IO
 *              - Capture using TVP5146 over BT.656
 *              - support for interfacing decoders using sub device model
 *              - Work with DM355 or DM6446 CCDC to do Raw Bayer RGB/YUV
 *                data capture to SDRAM.
 *    TODO list
 *              - Support multiple REQBUF after open
 *              - Support for de-allocating buffers through REQBUF
 *              - Support for Raw Bayer RGB capture
 *              - Support for chaining Image Processor
 *              - Support for static allocation of buffers
 *              - Support for USERPTR IO
 *              - Support for STREAMON before QBUF
 *              - Support for control ioctls
 */
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <media/v4l2-common.h>
#include <linux/io.h>
#include <media/davinci/vpfe_capture.h>
#include "ccdc_hw_device.h"

static int debug;
static u32 numbuffers = 3;
static u32 bufsize = (720 * 576 * 2);

module_param(numbuffers, uint, S_IRUGO);
module_param(bufsize, uint, S_IRUGO);
module_param(debug, int, 0644);

MODULE_PARM_DESC(numbuffers, "buffer count (default:3)");
MODULE_PARM_DESC(bufsize, "buffer size in bytes (default:720 x 576 x 2)");
MODULE_PARM_DESC(debug, "Debug level 0-1");

MODULE_DESCRIPTION("VPFE Video for Linux Capture Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments");

/* standard information */
struct vpfe_standard {
        v4l2_std_id std_id;
        unsigned int width;
        unsigned int height;
        struct v4l2_fract pixelaspect;
        /* 0 - progressive, 1 - interlaced */
        int frame_format;
};

/* ccdc configuration */
struct ccdc_config {
        /* This make sure vpfe is probed and ready to go */
        int vpfe_probed;
        /* name of ccdc device */
        char name[32];
};

/* data structures */
static struct vpfe_config_params config_params = {
        .min_numbuffers = 3,
        .numbuffers = 3,
        .min_bufsize = 720 * 480 * 2,
        .device_bufsize = 720 * 576 * 2,
};

/* ccdc device registered */
static const struct ccdc_hw_device *ccdc_dev;
/* lock for accessing ccdc information */
static DEFINE_MUTEX(ccdc_lock);
/* ccdc configuration */
static struct ccdc_config *ccdc_cfg;

static const struct vpfe_standard vpfe_standards[] = {
        {V4L2_STD_525_60, 720, 480, {11, 10}, 1},
        {V4L2_STD_625_50, 720, 576, {54, 59}, 1},
};

/* Used when raw Bayer image from ccdc is directly captured to SDRAM */
static const struct vpfe_pixel_format vpfe_pix_fmts[] = {
        {
                .fmtdesc = {
                        .index = 0,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "Bayer GrRBGb 8bit A-Law compr.",
                        .pixelformat = V4L2_PIX_FMT_SBGGR8,
                },
                .bpp = 1,
        },
        {
                .fmtdesc = {
                        .index = 1,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "Bayer GrRBGb - 16bit",
                        .pixelformat = V4L2_PIX_FMT_SBGGR16,
                },
                .bpp = 2,
        },
        {
                .fmtdesc = {
                        .index = 2,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "Bayer GrRBGb 8bit DPCM compr.",
                        .pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
                },
                .bpp = 1,
        },
        {
                .fmtdesc = {
                        .index = 3,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "YCbCr 4:2:2 Interleaved UYVY",
                        .pixelformat = V4L2_PIX_FMT_UYVY,
                },
                .bpp = 2,
        },
        {
                .fmtdesc = {
                        .index = 4,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "YCbCr 4:2:2 Interleaved YUYV",
                        .pixelformat = V4L2_PIX_FMT_YUYV,
                },
                .bpp = 2,
        },
        {
                .fmtdesc = {
                        .index = 5,
                        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
                        .description = "Y/CbCr 4:2:0 - Semi planar",
                        .pixelformat = V4L2_PIX_FMT_NV12,
                },
                .bpp = 1,
        },
};

/*
 * vpfe_lookup_pix_format()
 * lookup an entry in the vpfe pix format table based on pix_format
 */
static const struct vpfe_pixel_format *vpfe_lookup_pix_format(u32 pix_format)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(vpfe_pix_fmts); i++) {
                if (pix_format == vpfe_pix_fmts[i].fmtdesc.pixelformat)
                        return &vpfe_pix_fmts[i];
        }
        return NULL;
}

/*
 * vpfe_register_ccdc_device. CCDC module calls this to
 * register with vpfe capture
 */
int vpfe_register_ccdc_device(const struct ccdc_hw_device *dev)
{
        int ret = 0;
        printk(KERN_NOTICE "vpfe_register_ccdc_device: %s\n", dev->name);

        BUG_ON(!dev->hw_ops.open);
        BUG_ON(!dev->hw_ops.enable);
        BUG_ON(!dev->hw_ops.set_hw_if_params);
        BUG_ON(!dev->hw_ops.configure);
        BUG_ON(!dev->hw_ops.set_buftype);
        BUG_ON(!dev->hw_ops.get_buftype);
        BUG_ON(!dev->hw_ops.enum_pix);
        BUG_ON(!dev->hw_ops.set_frame_format);
        BUG_ON(!dev->hw_ops.get_frame_format);
        BUG_ON(!dev->hw_ops.get_pixel_format);
        BUG_ON(!dev->hw_ops.set_pixel_format);
        BUG_ON(!dev->hw_ops.set_image_window);
        BUG_ON(!dev->hw_ops.get_image_window);
        BUG_ON(!dev->hw_ops.get_line_length);
        BUG_ON(!dev->hw_ops.getfid);

        mutex_lock(&ccdc_lock);
        if (!ccdc_cfg) {
                /*
                 * TODO. Will this ever happen? if so, we need to fix it.
                 * Proabably we need to add the request to a linked list and
                 * walk through it during vpfe probe
                 */
                printk(KERN_ERR "vpfe capture not initialized\n");
                ret = -EFAULT;
                goto unlock;
        }

        if (strcmp(dev->name, ccdc_cfg->name)) {
                /* ignore this ccdc */
                ret = -EINVAL;
                goto unlock;
        }

        if (ccdc_dev) {
                printk(KERN_ERR "ccdc already registered\n");
                ret = -EINVAL;
                goto unlock;
        }

        ccdc_dev = dev;
unlock:
        mutex_unlock(&ccdc_lock);
        return ret;
}
EXPORT_SYMBOL(vpfe_register_ccdc_device);

/*
 * vpfe_unregister_ccdc_device. CCDC module calls this to
 * unregister with vpfe capture
 */
void vpfe_unregister_ccdc_device(const struct ccdc_hw_device *dev)
{
        if (!dev) {
                printk(KERN_ERR "invalid ccdc device ptr\n");
                return;
        }

        printk(KERN_NOTICE "vpfe_unregister_ccdc_device, dev->name = %s\n",
                dev->name);

        if (strcmp(dev->name, ccdc_cfg->name)) {
                /* ignore this ccdc */
                return;
        }

        mutex_lock(&ccdc_lock);
        ccdc_dev = NULL;
        mutex_unlock(&ccdc_lock);
}
EXPORT_SYMBOL(vpfe_unregister_ccdc_device);

/*
 * vpfe_config_ccdc_image_format()
 * For a pix format, configure ccdc to setup the capture
 */
static int vpfe_config_ccdc_image_format(struct vpfe_device *vpfe_dev)
{
        enum ccdc_frmfmt frm_fmt = CCDC_FRMFMT_INTERLACED;
        int ret = 0;

        if (ccdc_dev->hw_ops.set_pixel_format(
                        vpfe_dev->fmt.fmt.pix.pixelformat) < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                        "couldn't set pix format in ccdc\n");
                return -EINVAL;
        }
        /* configure the image window */
        ccdc_dev->hw_ops.set_image_window(&vpfe_dev->crop);

        switch (vpfe_dev->fmt.fmt.pix.field) {
        case V4L2_FIELD_INTERLACED:
                /* do nothing, since it is default */
                ret = ccdc_dev->hw_ops.set_buftype(
                                CCDC_BUFTYPE_FLD_INTERLEAVED);
                break;
        case V4L2_FIELD_NONE:
                frm_fmt = CCDC_FRMFMT_PROGRESSIVE;
                /* buffer type only applicable for interlaced scan */
                break;
        case V4L2_FIELD_SEQ_TB:
                ret = ccdc_dev->hw_ops.set_buftype(
                                CCDC_BUFTYPE_FLD_SEPARATED);
                break;
        default:
                return -EINVAL;
        }

        /* set the frame format */
        if (!ret)
                ret = ccdc_dev->hw_ops.set_frame_format(frm_fmt);
        return ret;
}
/*
 * vpfe_config_image_format()
 * For a given standard, this functions sets up the default
 * pix format & crop values in the vpfe device and ccdc.  It first
 * starts with defaults based values from the standard table.
 * It then checks if sub device supports get_fmt and then override the
 * values based on that.Sets crop values to match with scan resolution
 * starting at 0,0. It calls vpfe_config_ccdc_image_format() set the
 * values in ccdc
 */
static int vpfe_config_image_format(struct vpfe_device *vpfe_dev,
                                    v4l2_std_id std_id)
{
        struct vpfe_subdev_info *sdinfo = vpfe_dev->current_subdev;
        struct v4l2_subdev_format fmt = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_mbus_framefmt *mbus_fmt = &fmt.format;
        struct v4l2_pix_format *pix = &vpfe_dev->fmt.fmt.pix;
        int i, ret;

        for (i = 0; i < ARRAY_SIZE(vpfe_standards); i++) {
                if (vpfe_standards[i].std_id & std_id) {
                        vpfe_dev->std_info.active_pixels =
                                        vpfe_standards[i].width;
                        vpfe_dev->std_info.active_lines =
                                        vpfe_standards[i].height;
                        vpfe_dev->std_info.frame_format =
                                        vpfe_standards[i].frame_format;
                        vpfe_dev->std_index = i;
                        break;
                }
        }

        if (i ==  ARRAY_SIZE(vpfe_standards)) {
                v4l2_err(&vpfe_dev->v4l2_dev, "standard not supported\n");
                return -EINVAL;
        }

        vpfe_dev->crop.top = 0;
        vpfe_dev->crop.left = 0;
        vpfe_dev->crop.width = vpfe_dev->std_info.active_pixels;
        vpfe_dev->crop.height = vpfe_dev->std_info.active_lines;
        pix->width = vpfe_dev->crop.width;
        pix->height = vpfe_dev->crop.height;

        /* first field and frame format based on standard frame format */
        if (vpfe_dev->std_info.frame_format) {
                pix->field = V4L2_FIELD_INTERLACED;
                /* assume V4L2_PIX_FMT_UYVY as default */
                pix->pixelformat = V4L2_PIX_FMT_UYVY;
                v4l2_fill_mbus_format(mbus_fmt, pix,
                                MEDIA_BUS_FMT_YUYV10_2X10);
        } else {
                pix->field = V4L2_FIELD_NONE;
                /* assume V4L2_PIX_FMT_SBGGR8 */
                pix->pixelformat = V4L2_PIX_FMT_SBGGR8;
                v4l2_fill_mbus_format(mbus_fmt, pix,
                                MEDIA_BUS_FMT_SBGGR8_1X8);
        }

        /* if sub device supports get_fmt, override the defaults */
        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev,
                        sdinfo->grp_id, pad, get_fmt, NULL, &fmt);

        if (ret && ret != -ENOIOCTLCMD) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                        "error in getting get_fmt from sub device\n");
                return ret;
        }
        v4l2_fill_pix_format(pix, mbus_fmt);
        pix->bytesperline = pix->width * 2;
        pix->sizeimage = pix->bytesperline * pix->height;

        /* Sets the values in CCDC */
        ret = vpfe_config_ccdc_image_format(vpfe_dev);
        if (ret)
                return ret;

        /* Update the values of sizeimage and bytesperline */
        pix->bytesperline = ccdc_dev->hw_ops.get_line_length();
        pix->sizeimage = pix->bytesperline * pix->height;

        return 0;
}

static int vpfe_initialize_device(struct vpfe_device *vpfe_dev)
{
        int ret;

        /* set first input of current subdevice as the current input */
        vpfe_dev->current_input = 0;

        /* set default standard */
        vpfe_dev->std_index = 0;

        /* Configure the default format information */
        ret = vpfe_config_image_format(vpfe_dev,
                                vpfe_standards[vpfe_dev->std_index].std_id);
        if (ret)
                return ret;

        /* now open the ccdc device to initialize it */
        mutex_lock(&ccdc_lock);
        if (!ccdc_dev) {
                v4l2_err(&vpfe_dev->v4l2_dev, "ccdc device not registered\n");
                ret = -ENODEV;
                goto unlock;
        }

        if (!try_module_get(ccdc_dev->owner)) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Couldn't lock ccdc module\n");
                ret = -ENODEV;
                goto unlock;
        }
        ret = ccdc_dev->hw_ops.open(vpfe_dev->pdev);
        if (!ret)
                vpfe_dev->initialized = 1;

        /* Clear all VPFE/CCDC interrupts */
        if (vpfe_dev->cfg->clr_intr)
                vpfe_dev->cfg->clr_intr(-1);

unlock:
        mutex_unlock(&ccdc_lock);
        return ret;
}

/*
 * vpfe_open : It creates object of file handle structure and
 * stores it in private_data  member of filepointer
 */
static int vpfe_open(struct file *file)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct video_device *vdev = video_devdata(file);
        struct vpfe_fh *fh;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_open\n");

        if (!vpfe_dev->cfg->num_subdevs) {
                v4l2_err(&vpfe_dev->v4l2_dev, "No decoder registered\n");
                return -ENODEV;
        }

        /* Allocate memory for the file handle object */
        fh = kmalloc(sizeof(*fh), GFP_KERNEL);
        if (!fh)
                return -ENOMEM;

        /* store pointer to fh in private_data member of file */
        file->private_data = fh;
        fh->vpfe_dev = vpfe_dev;
        v4l2_fh_init(&fh->fh, vdev);
        mutex_lock(&vpfe_dev->lock);
        /* If decoder is not initialized. initialize it */
        if (!vpfe_dev->initialized) {
                if (vpfe_initialize_device(vpfe_dev)) {
                        mutex_unlock(&vpfe_dev->lock);
                        v4l2_fh_exit(&fh->fh);
                        kfree(fh);
                        return -ENODEV;
                }
        }
        /* Increment device usrs counter */
        vpfe_dev->usrs++;
        /* Set io_allowed member to false */
        fh->io_allowed = 0;
        v4l2_fh_add(&fh->fh);
        mutex_unlock(&vpfe_dev->lock);
        return 0;
}

static void vpfe_schedule_next_buffer(struct vpfe_device *vpfe_dev)
{
        unsigned long addr;

        vpfe_dev->next_frm = list_entry(vpfe_dev->dma_queue.next,
                                        struct videobuf_buffer, queue);
        list_del(&vpfe_dev->next_frm->queue);
        vpfe_dev->next_frm->state = VIDEOBUF_ACTIVE;
        addr = videobuf_to_dma_contig(vpfe_dev->next_frm);

        ccdc_dev->hw_ops.setfbaddr(addr);
}

static void vpfe_schedule_bottom_field(struct vpfe_device *vpfe_dev)
{
        unsigned long addr;

        addr = videobuf_to_dma_contig(vpfe_dev->cur_frm);
        addr += vpfe_dev->field_off;
        ccdc_dev->hw_ops.setfbaddr(addr);
}

static void vpfe_process_buffer_complete(struct vpfe_device *vpfe_dev)
{
        vpfe_dev->cur_frm->ts = ktime_get_ns();
        vpfe_dev->cur_frm->state = VIDEOBUF_DONE;
        vpfe_dev->cur_frm->size = vpfe_dev->fmt.fmt.pix.sizeimage;
        wake_up_interruptible(&vpfe_dev->cur_frm->done);
        vpfe_dev->cur_frm = vpfe_dev->next_frm;
}

/* ISR for VINT0*/
static irqreturn_t vpfe_isr(int irq, void *dev_id)
{
        struct vpfe_device *vpfe_dev = dev_id;
        enum v4l2_field field;
        int fid;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "\nStarting vpfe_isr...\n");
        field = vpfe_dev->fmt.fmt.pix.field;

        /* if streaming not started, don't do anything */
        if (!vpfe_dev->started)
                goto clear_intr;

        /* only for 6446 this will be applicable */
        if (ccdc_dev->hw_ops.reset)
                ccdc_dev->hw_ops.reset();

        if (field == V4L2_FIELD_NONE) {
                /* handle progressive frame capture */
                v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
                        "frame format is progressive...\n");
                if (vpfe_dev->cur_frm != vpfe_dev->next_frm)
                        vpfe_process_buffer_complete(vpfe_dev);
                goto clear_intr;
        }

        /* interlaced or TB capture check which field we are in hardware */
        fid = ccdc_dev->hw_ops.getfid();

        /* switch the software maintained field id */
        vpfe_dev->field_id ^= 1;
        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "field id = %x:%x.\n",
                fid, vpfe_dev->field_id);
        if (fid == vpfe_dev->field_id) {
                /* we are in-sync here,continue */
                if (fid == 0) {
                        /*
                         * One frame is just being captured. If the next frame
                         * is available, release the current frame and move on
                         */
                        if (vpfe_dev->cur_frm != vpfe_dev->next_frm)
                                vpfe_process_buffer_complete(vpfe_dev);
                        /*
                         * based on whether the two fields are stored
                         * interleavely or separately in memory, reconfigure
                         * the CCDC memory address
                         */
                        if (field == V4L2_FIELD_SEQ_TB)
                                vpfe_schedule_bottom_field(vpfe_dev);
                        goto clear_intr;
                }
                /*
                 * if one field is just being captured configure
                 * the next frame get the next frame from the empty
                 * queue if no frame is available hold on to the
                 * current buffer
                 */
                spin_lock(&vpfe_dev->dma_queue_lock);
                if (!list_empty(&vpfe_dev->dma_queue) &&
                    vpfe_dev->cur_frm == vpfe_dev->next_frm)
                        vpfe_schedule_next_buffer(vpfe_dev);
                spin_unlock(&vpfe_dev->dma_queue_lock);
        } else if (fid == 0) {
                /*
                 * out of sync. Recover from any hardware out-of-sync.
                 * May loose one frame
                 */
                vpfe_dev->field_id = fid;
        }
clear_intr:
        if (vpfe_dev->cfg->clr_intr)
                vpfe_dev->cfg->clr_intr(irq);

        return IRQ_HANDLED;
}

/* vdint1_isr - isr handler for VINT1 interrupt */
static irqreturn_t vdint1_isr(int irq, void *dev_id)
{
        struct vpfe_device *vpfe_dev = dev_id;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "\nInside vdint1_isr...\n");

        /* if streaming not started, don't do anything */
        if (!vpfe_dev->started) {
                if (vpfe_dev->cfg->clr_intr)
                        vpfe_dev->cfg->clr_intr(irq);
                return IRQ_HANDLED;
        }

        spin_lock(&vpfe_dev->dma_queue_lock);
        if ((vpfe_dev->fmt.fmt.pix.field == V4L2_FIELD_NONE) &&
            !list_empty(&vpfe_dev->dma_queue) &&
            vpfe_dev->cur_frm == vpfe_dev->next_frm)
                vpfe_schedule_next_buffer(vpfe_dev);
        spin_unlock(&vpfe_dev->dma_queue_lock);

        if (vpfe_dev->cfg->clr_intr)
                vpfe_dev->cfg->clr_intr(irq);

        return IRQ_HANDLED;
}

static void vpfe_detach_irq(struct vpfe_device *vpfe_dev)
{
        enum ccdc_frmfmt frame_format;

        frame_format = ccdc_dev->hw_ops.get_frame_format();
        if (frame_format == CCDC_FRMFMT_PROGRESSIVE)
                free_irq(vpfe_dev->ccdc_irq1, vpfe_dev);
}

static int vpfe_attach_irq(struct vpfe_device *vpfe_dev)
{
        enum ccdc_frmfmt frame_format;

        frame_format = ccdc_dev->hw_ops.get_frame_format();
        if (frame_format == CCDC_FRMFMT_PROGRESSIVE) {
                return request_irq(vpfe_dev->ccdc_irq1, vdint1_isr,
                                    0, "vpfe_capture1",
                                    vpfe_dev);
        }
        return 0;
}

/* vpfe_stop_ccdc_capture: stop streaming in ccdc/isif */
static void vpfe_stop_ccdc_capture(struct vpfe_device *vpfe_dev)
{
        vpfe_dev->started = 0;
        ccdc_dev->hw_ops.enable(0);
        if (ccdc_dev->hw_ops.enable_out_to_sdram)
                ccdc_dev->hw_ops.enable_out_to_sdram(0);
}

/*
 * vpfe_release : This function deletes buffer queue, frees the
 * buffers and the vpfe file  handle
 */
static int vpfe_release(struct file *file)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_fh *fh = file->private_data;
        struct vpfe_subdev_info *sdinfo;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_release\n");

        /* Get the device lock */
        mutex_lock(&vpfe_dev->lock);
        /* if this instance is doing IO */
        if (fh->io_allowed) {
                if (vpfe_dev->started) {
                        sdinfo = vpfe_dev->current_subdev;
                        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev,
                                                         sdinfo->grp_id,
                                                         video, s_stream, 0);
                        if (ret && (ret != -ENOIOCTLCMD))
                                v4l2_err(&vpfe_dev->v4l2_dev,
                                "stream off failed in subdev\n");
                        vpfe_stop_ccdc_capture(vpfe_dev);
                        vpfe_detach_irq(vpfe_dev);
                        videobuf_streamoff(&vpfe_dev->buffer_queue);
                }
                vpfe_dev->io_usrs = 0;
                vpfe_dev->numbuffers = config_params.numbuffers;
                videobuf_stop(&vpfe_dev->buffer_queue);
                videobuf_mmap_free(&vpfe_dev->buffer_queue);
        }

        /* Decrement device usrs counter */
        vpfe_dev->usrs--;
        v4l2_fh_del(&fh->fh);
        v4l2_fh_exit(&fh->fh);
        /* If this is the last file handle */
        if (!vpfe_dev->usrs) {
                vpfe_dev->initialized = 0;
                if (ccdc_dev->hw_ops.close)
                        ccdc_dev->hw_ops.close(vpfe_dev->pdev);
                module_put(ccdc_dev->owner);
        }
        mutex_unlock(&vpfe_dev->lock);
        file->private_data = NULL;
        /* Free memory allocated to file handle object */
        kfree(fh);
        return 0;
}

/*
 * vpfe_mmap : It is used to map kernel space buffers
 * into user spaces
 */
static int vpfe_mmap(struct file *file, struct vm_area_struct *vma)
{
        /* Get the device object and file handle object */
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_mmap\n");

        return videobuf_mmap_mapper(&vpfe_dev->buffer_queue, vma);
}

/*
 * vpfe_poll: It is used for select/poll system call
 */
static __poll_t vpfe_poll(struct file *file, poll_table *wait)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_poll\n");

        if (vpfe_dev->started)
                return videobuf_poll_stream(file,
                                            &vpfe_dev->buffer_queue, wait);
        return 0;
}

/* vpfe capture driver file operations */
static const struct v4l2_file_operations vpfe_fops = {
        .owner = THIS_MODULE,
        .open = vpfe_open,
        .release = vpfe_release,
        .unlocked_ioctl = video_ioctl2,
        .mmap = vpfe_mmap,
        .poll = vpfe_poll
};

/*
 * vpfe_check_format()
 * This function adjust the input pixel format as per hardware
 * capabilities and update the same in pixfmt.
 * Following algorithm used :-
 *
 *      If given pixformat is not in the vpfe list of pix formats or not
 *      supported by the hardware, current value of pixformat in the device
 *      is used
 *      If given field is not supported, then current field is used. If field
 *      is different from current, then it is matched with that from sub device.
 *      Minimum height is 2 lines for interlaced or tb field and 1 line for
 *      progressive. Maximum height is clamped to active active lines of scan
 *      Minimum width is 32 bytes in memory and width is clamped to active
 *      pixels of scan.
 *      bytesperline is a multiple of 32.
 */
static const struct vpfe_pixel_format *
        vpfe_check_format(struct vpfe_device *vpfe_dev,
                          struct v4l2_pix_format *pixfmt)
{
        u32 min_height = 1, min_width = 32, max_width, max_height;
        const struct vpfe_pixel_format *vpfe_pix_fmt;
        u32 pix;
        int temp, found;

        vpfe_pix_fmt = vpfe_lookup_pix_format(pixfmt->pixelformat);
        if (!vpfe_pix_fmt) {
                /*
                 * use current pixel format in the vpfe device. We
                 * will find this pix format in the table
                 */
                pixfmt->pixelformat = vpfe_dev->fmt.fmt.pix.pixelformat;
                vpfe_pix_fmt = vpfe_lookup_pix_format(pixfmt->pixelformat);
        }

        /* check if hw supports it */
        temp = 0;
        found = 0;
        while (ccdc_dev->hw_ops.enum_pix(&pix, temp) >= 0) {
                if (vpfe_pix_fmt->fmtdesc.pixelformat == pix) {
                        found = 1;
                        break;
                }
                temp++;
        }

        if (!found) {
                /* use current pixel format */
                pixfmt->pixelformat = vpfe_dev->fmt.fmt.pix.pixelformat;
                /*
                 * Since this is currently used in the vpfe device, we
                 * will find this pix format in the table
                 */
                vpfe_pix_fmt = vpfe_lookup_pix_format(pixfmt->pixelformat);
        }

        /* check what field format is supported */
        if (pixfmt->field == V4L2_FIELD_ANY) {
                /* if field is any, use current value as default */
                pixfmt->field = vpfe_dev->fmt.fmt.pix.field;
        }

        /*
         * if field is not same as current field in the vpfe device
         * try matching the field with the sub device field
         */
        if (vpfe_dev->fmt.fmt.pix.field != pixfmt->field) {
                /*
                 * If field value is not in the supported fields, use current
                 * field used in the device as default
                 */
                switch (pixfmt->field) {
                case V4L2_FIELD_INTERLACED:
                case V4L2_FIELD_SEQ_TB:
                        /* if sub device is supporting progressive, use that */
                        if (!vpfe_dev->std_info.frame_format)
                                pixfmt->field = V4L2_FIELD_NONE;
                        break;
                case V4L2_FIELD_NONE:
                        if (vpfe_dev->std_info.frame_format)
                                pixfmt->field = V4L2_FIELD_INTERLACED;
                        break;

                default:
                        /* use current field as default */
                        pixfmt->field = vpfe_dev->fmt.fmt.pix.field;
                        break;
                }
        }

        /* Now adjust image resolutions supported */
        if (pixfmt->field == V4L2_FIELD_INTERLACED ||
            pixfmt->field == V4L2_FIELD_SEQ_TB)
                min_height = 2;

        max_width = vpfe_dev->std_info.active_pixels;
        max_height = vpfe_dev->std_info.active_lines;
        min_width /= vpfe_pix_fmt->bpp;

        v4l2_info(&vpfe_dev->v4l2_dev, "width = %d, height = %d, bpp = %d\n",
                  pixfmt->width, pixfmt->height, vpfe_pix_fmt->bpp);

        pixfmt->width = clamp((pixfmt->width), min_width, max_width);
        pixfmt->height = clamp((pixfmt->height), min_height, max_height);

        /* If interlaced, adjust height to be a multiple of 2 */
        if (pixfmt->field == V4L2_FIELD_INTERLACED)
                pixfmt->height &= (~1);
        /*
         * recalculate bytesperline and sizeimage since width
         * and height might have changed
         */
        pixfmt->bytesperline = (((pixfmt->width * vpfe_pix_fmt->bpp) + 31)
                                & ~31);
        if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12)
                pixfmt->sizeimage =
                        pixfmt->bytesperline * pixfmt->height +
                        ((pixfmt->bytesperline * pixfmt->height) >> 1);
        else
                pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;

        v4l2_info(&vpfe_dev->v4l2_dev, "adjusted width = %d, height = %d, bpp = %d, bytesperline = %d, sizeimage = %d\n",
                 pixfmt->width, pixfmt->height, vpfe_pix_fmt->bpp,
                 pixfmt->bytesperline, pixfmt->sizeimage);
        return vpfe_pix_fmt;
}

static int vpfe_querycap(struct file *file, void  *priv,
                               struct v4l2_capability *cap)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_querycap\n");

        cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
        strscpy(cap->driver, CAPTURE_DRV_NAME, sizeof(cap->driver));
        strscpy(cap->bus_info, "VPFE", sizeof(cap->bus_info));
        strscpy(cap->card, vpfe_dev->cfg->card_name, sizeof(cap->card));
        return 0;
}

static int vpfe_g_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_g_fmt_vid_cap\n");
        /* Fill in the information about format */
        *fmt = vpfe_dev->fmt;
        return 0;
}

static int vpfe_enum_fmt_vid_cap(struct file *file, void  *priv,
                                   struct v4l2_fmtdesc *fmt)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        const struct vpfe_pixel_format *pix_fmt;
        int temp_index;
        u32 pix;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_enum_fmt_vid_cap\n");

        if (ccdc_dev->hw_ops.enum_pix(&pix, fmt->index) < 0)
                return -EINVAL;

        /* Fill in the information about format */
        pix_fmt = vpfe_lookup_pix_format(pix);
        if (pix_fmt) {
                temp_index = fmt->index;
                *fmt = pix_fmt->fmtdesc;
                fmt->index = temp_index;
                return 0;
        }
        return -EINVAL;
}

static int vpfe_s_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        const struct vpfe_pixel_format *pix_fmts;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_s_fmt_vid_cap\n");

        /* If streaming is started, return error */
        if (vpfe_dev->started) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Streaming is started\n");
                return -EBUSY;
        }

        /* Check for valid frame format */
        pix_fmts = vpfe_check_format(vpfe_dev, &fmt->fmt.pix);
        if (!pix_fmts)
                return -EINVAL;

        /* store the pixel format in the device  object */
        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        /* First detach any IRQ if currently attached */
        vpfe_detach_irq(vpfe_dev);
        vpfe_dev->fmt = *fmt;
        /* set image capture parameters in the ccdc */
        ret = vpfe_config_ccdc_image_format(vpfe_dev);
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_try_fmt_vid_cap(struct file *file, void *priv,
                                  struct v4l2_format *f)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        const struct vpfe_pixel_format *pix_fmts;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_try_fmt_vid_cap\n");

        pix_fmts = vpfe_check_format(vpfe_dev, &f->fmt.pix);
        if (!pix_fmts)
                return -EINVAL;
        return 0;
}

/*
 * vpfe_get_subdev_input_index - Get subdev index and subdev input index for a
 * given app input index
 */
static int vpfe_get_subdev_input_index(struct vpfe_device *vpfe_dev,
                                        int *subdev_index,
                                        int *subdev_input_index,
                                        int app_input_index)
{
        struct vpfe_config *cfg = vpfe_dev->cfg;
        struct vpfe_subdev_info *sdinfo;
        int i, j = 0;

        for (i = 0; i < cfg->num_subdevs; i++) {
                sdinfo = &cfg->sub_devs[i];
                if (app_input_index < (j + sdinfo->num_inputs)) {
                        *subdev_index = i;
                        *subdev_input_index = app_input_index - j;
                        return 0;
                }
                j += sdinfo->num_inputs;
        }
        return -EINVAL;
}

/*
 * vpfe_get_app_input - Get app input index for a given subdev input index
 * driver stores the input index of the current sub device and translate it
 * when application request the current input
 */

static int vpfe_get_app_input_index(struct vpfe_device *vpfe_dev,
                                    int *app_input_index)
{
        struct vpfe_config *cfg = vpfe_dev->cfg;
        struct vpfe_subdev_info *sdinfo;
        int i, j = 0;

        for (i = 0; i < cfg->num_subdevs; i++) {
                sdinfo = &cfg->sub_devs[i];
                if (!strcmp(sdinfo->name, vpfe_dev->current_subdev->name)) {
                        if (vpfe_dev->current_input >= sdinfo->num_inputs)
                                return -1;
                        *app_input_index = j + vpfe_dev->current_input;
                        return 0;
                }
                j += sdinfo->num_inputs;
        }
        return -EINVAL;
}

static int vpfe_enum_input(struct file *file, void *priv,
                                 struct v4l2_input *inp)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        int subdev, index ;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_enum_input\n");

        if (vpfe_get_subdev_input_index(vpfe_dev,
                                        &subdev,
                                        &index,
                                        inp->index) < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev, "input information not found for the subdev\n");
                return -EINVAL;
        }
        sdinfo = &vpfe_dev->cfg->sub_devs[subdev];
        *inp = sdinfo->inputs[index];
        return 0;
}

static int vpfe_g_input(struct file *file, void *priv, unsigned int *index)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_g_input\n");

        return vpfe_get_app_input_index(vpfe_dev, index);
}


static int vpfe_s_input(struct file *file, void *priv, unsigned int index)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct v4l2_subdev *sd;
        struct vpfe_subdev_info *sdinfo;
        int subdev_index, inp_index;
        struct vpfe_route *route;
        u32 input, output;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_s_input\n");

        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        /*
         * If streaming is started return device busy
         * error
         */
        if (vpfe_dev->started) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Streaming is on\n");
                ret = -EBUSY;
                goto unlock_out;
        }
        ret = vpfe_get_subdev_input_index(vpfe_dev,
                                          &subdev_index,
                                          &inp_index,
                                          index);
        if (ret < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev, "invalid input index\n");
                goto unlock_out;
        }

        sdinfo = &vpfe_dev->cfg->sub_devs[subdev_index];
        sd = vpfe_dev->sd[subdev_index];
        route = &sdinfo->routes[inp_index];
        if (route && sdinfo->can_route) {
                input = route->input;
                output = route->output;
        } else {
                input = 0;
                output = 0;
        }

        if (sd)
                ret = v4l2_subdev_call(sd, video, s_routing, input, output, 0);

        if (ret) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                        "vpfe_doioctl:error in setting input in decoder\n");
                ret = -EINVAL;
                goto unlock_out;
        }
        vpfe_dev->current_subdev = sdinfo;
        if (sd)
                vpfe_dev->v4l2_dev.ctrl_handler = sd->ctrl_handler;
        vpfe_dev->current_input = index;
        vpfe_dev->std_index = 0;

        /* set the bus/interface parameter for the sub device in ccdc */
        ret = ccdc_dev->hw_ops.set_hw_if_params(&sdinfo->ccdc_if_params);
        if (ret)
                goto unlock_out;

        /* set the default image parameters in the device */
        ret = vpfe_config_image_format(vpfe_dev,
                                vpfe_standards[vpfe_dev->std_index].std_id);
unlock_out:
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_querystd(struct file *file, void *priv, v4l2_std_id *std_id)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_querystd\n");

        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        sdinfo = vpfe_dev->current_subdev;
        if (ret)
                return ret;
        /* Call querystd function of decoder device */
        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev, sdinfo->grp_id,
                                         video, querystd, std_id);
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_s_std(struct file *file, void *priv, v4l2_std_id std_id)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_s_std\n");

        /* Call decoder driver function to set the standard */
        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        sdinfo = vpfe_dev->current_subdev;
        /* If streaming is started, return device busy error */
        if (vpfe_dev->started) {
                v4l2_err(&vpfe_dev->v4l2_dev, "streaming is started\n");
                ret = -EBUSY;
                goto unlock_out;
        }

        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev, sdinfo->grp_id,
                                         video, s_std, std_id);
        if (ret < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Failed to set standard\n");
                goto unlock_out;
        }
        ret = vpfe_config_image_format(vpfe_dev, std_id);

unlock_out:
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_g_std(struct file *file, void *priv, v4l2_std_id *std_id)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_g_std\n");

        *std_id = vpfe_standards[vpfe_dev->std_index].std_id;
        return 0;
}
/*
 *  Videobuf operations
 */
static int vpfe_videobuf_setup(struct videobuf_queue *vq,
                                unsigned int *count,
                                unsigned int *size)
{
        struct vpfe_fh *fh = vq->priv_data;
        struct vpfe_device *vpfe_dev = fh->vpfe_dev;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_buffer_setup\n");
        *size = vpfe_dev->fmt.fmt.pix.sizeimage;
        if (vpfe_dev->memory == V4L2_MEMORY_MMAP &&
                vpfe_dev->fmt.fmt.pix.sizeimage > config_params.device_bufsize)
                *size = config_params.device_bufsize;

        if (*count < config_params.min_numbuffers)
                *count = config_params.min_numbuffers;
        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
                "count=%d, size=%d\n", *count, *size);
        return 0;
}

static int vpfe_videobuf_prepare(struct videobuf_queue *vq,
                                struct videobuf_buffer *vb,
                                enum v4l2_field field)
{
        struct vpfe_fh *fh = vq->priv_data;
        struct vpfe_device *vpfe_dev = fh->vpfe_dev;
        unsigned long addr;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_buffer_prepare\n");

        /* If buffer is not initialized, initialize it */
        if (VIDEOBUF_NEEDS_INIT == vb->state) {
                vb->width = vpfe_dev->fmt.fmt.pix.width;
                vb->height = vpfe_dev->fmt.fmt.pix.height;
                vb->size = vpfe_dev->fmt.fmt.pix.sizeimage;
                vb->field = field;

                ret = videobuf_iolock(vq, vb, NULL);
                if (ret < 0)
                        return ret;

                addr = videobuf_to_dma_contig(vb);
                /* Make sure user addresses are aligned to 32 bytes */
                if (!ALIGN(addr, 32))
                        return -EINVAL;

                vb->state = VIDEOBUF_PREPARED;
        }
        return 0;
}

static void vpfe_videobuf_queue(struct videobuf_queue *vq,
                                struct videobuf_buffer *vb)
{
        /* Get the file handle object and device object */
        struct vpfe_fh *fh = vq->priv_data;
        struct vpfe_device *vpfe_dev = fh->vpfe_dev;
        unsigned long flags;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_buffer_queue\n");

        /* add the buffer to the DMA queue */
        spin_lock_irqsave(&vpfe_dev->dma_queue_lock, flags);
        list_add_tail(&vb->queue, &vpfe_dev->dma_queue);
        spin_unlock_irqrestore(&vpfe_dev->dma_queue_lock, flags);

        /* Change state of the buffer */
        vb->state = VIDEOBUF_QUEUED;
}

static void vpfe_videobuf_release(struct videobuf_queue *vq,
                                  struct videobuf_buffer *vb)
{
        struct vpfe_fh *fh = vq->priv_data;
        struct vpfe_device *vpfe_dev = fh->vpfe_dev;
        unsigned long flags;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_videobuf_release\n");

        /*
         * We need to flush the buffer from the dma queue since
         * they are de-allocated
         */
        spin_lock_irqsave(&vpfe_dev->dma_queue_lock, flags);
        INIT_LIST_HEAD(&vpfe_dev->dma_queue);
        spin_unlock_irqrestore(&vpfe_dev->dma_queue_lock, flags);
        videobuf_dma_contig_free(vq, vb);
        vb->state = VIDEOBUF_NEEDS_INIT;
}

static const struct videobuf_queue_ops vpfe_videobuf_qops = {
        .buf_setup      = vpfe_videobuf_setup,
        .buf_prepare    = vpfe_videobuf_prepare,
        .buf_queue      = vpfe_videobuf_queue,
        .buf_release    = vpfe_videobuf_release,
};

/*
 * vpfe_reqbufs. currently support REQBUF only once opening
 * the device.
 */
static int vpfe_reqbufs(struct file *file, void *priv,
                        struct v4l2_requestbuffers *req_buf)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_fh *fh = file->private_data;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_reqbufs\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != req_buf->type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buffer type\n");
                return -EINVAL;
        }

        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        if (vpfe_dev->io_usrs != 0) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Only one IO user allowed\n");
                ret = -EBUSY;
                goto unlock_out;
        }

        vpfe_dev->memory = req_buf->memory;
        videobuf_queue_dma_contig_init(&vpfe_dev->buffer_queue,
                                &vpfe_videobuf_qops,
                                vpfe_dev->pdev,
                                &vpfe_dev->irqlock,
                                req_buf->type,
                                vpfe_dev->fmt.fmt.pix.field,
                                sizeof(struct videobuf_buffer),
                                fh, NULL);

        fh->io_allowed = 1;
        vpfe_dev->io_usrs = 1;
        INIT_LIST_HEAD(&vpfe_dev->dma_queue);
        ret = videobuf_reqbufs(&vpfe_dev->buffer_queue, req_buf);
unlock_out:
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_querybuf(struct file *file, void *priv,
                         struct v4l2_buffer *buf)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_querybuf\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != buf->type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buf type\n");
                return  -EINVAL;
        }

        if (vpfe_dev->memory != V4L2_MEMORY_MMAP) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid memory\n");
                return -EINVAL;
        }
        /* Call videobuf_querybuf to get information */
        return videobuf_querybuf(&vpfe_dev->buffer_queue, buf);
}

static int vpfe_qbuf(struct file *file, void *priv,
                     struct v4l2_buffer *p)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_fh *fh = file->private_data;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_qbuf\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != p->type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buf type\n");
                return -EINVAL;
        }

        /*
         * If this file handle is not allowed to do IO,
         * return error
         */
        if (!fh->io_allowed) {
                v4l2_err(&vpfe_dev->v4l2_dev, "fh->io_allowed\n");
                return -EACCES;
        }
        return videobuf_qbuf(&vpfe_dev->buffer_queue, p);
}

static int vpfe_dqbuf(struct file *file, void *priv,
                      struct v4l2_buffer *buf)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_dqbuf\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != buf->type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buf type\n");
                return -EINVAL;
        }
        return videobuf_dqbuf(&vpfe_dev->buffer_queue,
                                      buf, file->f_flags & O_NONBLOCK);
}

/*
 * vpfe_calculate_offsets : This function calculates buffers offset
 * for top and bottom field
 */
static void vpfe_calculate_offsets(struct vpfe_device *vpfe_dev)
{
        struct v4l2_rect image_win;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_calculate_offsets\n");

        ccdc_dev->hw_ops.get_image_window(&image_win);
        vpfe_dev->field_off = image_win.height * image_win.width;
}

/* vpfe_start_ccdc_capture: start streaming in ccdc/isif */
static void vpfe_start_ccdc_capture(struct vpfe_device *vpfe_dev)
{
        ccdc_dev->hw_ops.enable(1);
        if (ccdc_dev->hw_ops.enable_out_to_sdram)
                ccdc_dev->hw_ops.enable_out_to_sdram(1);
        vpfe_dev->started = 1;
}

/*
 * vpfe_streamon. Assume the DMA queue is not empty.
 * application is expected to call QBUF before calling
 * this ioctl. If not, driver returns error
 */
static int vpfe_streamon(struct file *file, void *priv,
                         enum v4l2_buf_type buf_type)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_fh *fh = file->private_data;
        struct vpfe_subdev_info *sdinfo;
        unsigned long addr;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_streamon\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != buf_type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buf type\n");
                return -EINVAL;
        }

        /* If file handle is not allowed IO, return error */
        if (!fh->io_allowed) {
                v4l2_err(&vpfe_dev->v4l2_dev, "fh->io_allowed\n");
                return -EACCES;
        }

        sdinfo = vpfe_dev->current_subdev;
        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev, sdinfo->grp_id,
                                        video, s_stream, 1);

        if (ret && (ret != -ENOIOCTLCMD)) {
                v4l2_err(&vpfe_dev->v4l2_dev, "stream on failed in subdev\n");
                return -EINVAL;
        }

        /* If buffer queue is empty, return error */
        if (list_empty(&vpfe_dev->buffer_queue.stream)) {
                v4l2_err(&vpfe_dev->v4l2_dev, "buffer queue is empty\n");
                return -EIO;
        }

        /* Call videobuf_streamon to start streaming * in videobuf */
        ret = videobuf_streamon(&vpfe_dev->buffer_queue);
        if (ret)
                return ret;


        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                goto streamoff;
        /* Get the next frame from the buffer queue */
        vpfe_dev->next_frm = list_entry(vpfe_dev->dma_queue.next,
                                        struct videobuf_buffer, queue);
        vpfe_dev->cur_frm = vpfe_dev->next_frm;
        /* Remove buffer from the buffer queue */
        list_del(&vpfe_dev->cur_frm->queue);
        /* Mark state of the current frame to active */
        vpfe_dev->cur_frm->state = VIDEOBUF_ACTIVE;
        /* Initialize field_id and started member */
        vpfe_dev->field_id = 0;
        addr = videobuf_to_dma_contig(vpfe_dev->cur_frm);

        /* Calculate field offset */
        vpfe_calculate_offsets(vpfe_dev);

        if (vpfe_attach_irq(vpfe_dev) < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                         "Error in attaching interrupt handle\n");
                ret = -EFAULT;
                goto unlock_out;
        }
        if (ccdc_dev->hw_ops.configure() < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                         "Error in configuring ccdc\n");
                ret = -EINVAL;
                goto unlock_out;
        }
        ccdc_dev->hw_ops.setfbaddr((unsigned long)(addr));
        vpfe_start_ccdc_capture(vpfe_dev);
        mutex_unlock(&vpfe_dev->lock);
        return ret;
unlock_out:
        mutex_unlock(&vpfe_dev->lock);
streamoff:
        videobuf_streamoff(&vpfe_dev->buffer_queue);
        return ret;
}

static int vpfe_streamoff(struct file *file, void *priv,
                          enum v4l2_buf_type buf_type)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct vpfe_fh *fh = file->private_data;
        struct vpfe_subdev_info *sdinfo;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_streamoff\n");

        if (V4L2_BUF_TYPE_VIDEO_CAPTURE != buf_type) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Invalid buf type\n");
                return -EINVAL;
        }

        /* If io is allowed for this file handle, return error */
        if (!fh->io_allowed) {
                v4l2_err(&vpfe_dev->v4l2_dev, "fh->io_allowed\n");
                return -EACCES;
        }

        /* If streaming is not started, return error */
        if (!vpfe_dev->started) {
                v4l2_err(&vpfe_dev->v4l2_dev, "device started\n");
                return -EINVAL;
        }

        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        vpfe_stop_ccdc_capture(vpfe_dev);
        vpfe_detach_irq(vpfe_dev);

        sdinfo = vpfe_dev->current_subdev;
        ret = v4l2_device_call_until_err(&vpfe_dev->v4l2_dev, sdinfo->grp_id,
                                        video, s_stream, 0);

        if (ret && (ret != -ENOIOCTLCMD))
                v4l2_err(&vpfe_dev->v4l2_dev, "stream off failed in subdev\n");
        ret = videobuf_streamoff(&vpfe_dev->buffer_queue);
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

static int vpfe_g_pixelaspect(struct file *file, void *priv,
                              int type, struct v4l2_fract *f)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_g_pixelaspect\n");

        if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;
        /* If std_index is invalid, then just return (== 1:1 aspect) */
        if (vpfe_dev->std_index >= ARRAY_SIZE(vpfe_standards))
                return 0;

        *f = vpfe_standards[vpfe_dev->std_index].pixelaspect;
        return 0;
}

static int vpfe_g_selection(struct file *file, void *priv,
                            struct v4l2_selection *sel)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_g_selection\n");

        if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;

        switch (sel->target) {
        case V4L2_SEL_TGT_CROP:
                sel->r = vpfe_dev->crop;
                break;
        case V4L2_SEL_TGT_CROP_DEFAULT:
        case V4L2_SEL_TGT_CROP_BOUNDS:
                sel->r.width = vpfe_standards[vpfe_dev->std_index].width;
                sel->r.height = vpfe_standards[vpfe_dev->std_index].height;
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int vpfe_s_selection(struct file *file, void *priv,
                            struct v4l2_selection *sel)
{
        struct vpfe_device *vpfe_dev = video_drvdata(file);
        struct v4l2_rect rect = sel->r;
        int ret;

        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev, "vpfe_s_selection\n");

        if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
            sel->target != V4L2_SEL_TGT_CROP)
                return -EINVAL;

        if (vpfe_dev->started) {
                /* make sure streaming is not started */
                v4l2_err(&vpfe_dev->v4l2_dev,
                        "Cannot change crop when streaming is ON\n");
                return -EBUSY;
        }

        ret = mutex_lock_interruptible(&vpfe_dev->lock);
        if (ret)
                return ret;

        if (rect.top < 0 || rect.left < 0) {
                v4l2_err(&vpfe_dev->v4l2_dev,
                        "doesn't support negative values for top & left\n");
                ret = -EINVAL;
                goto unlock_out;
        }

        /* adjust the width to 16 pixel boundary */
        rect.width = ((rect.width + 15) & ~0xf);

        /* make sure parameters are valid */
        if ((rect.left + rect.width >
                vpfe_dev->std_info.active_pixels) ||
            (rect.top + rect.height >
                vpfe_dev->std_info.active_lines)) {
                v4l2_err(&vpfe_dev->v4l2_dev, "Error in S_SELECTION params\n");
                ret = -EINVAL;
                goto unlock_out;
        }
        ccdc_dev->hw_ops.set_image_window(&rect);
        vpfe_dev->fmt.fmt.pix.width = rect.width;
        vpfe_dev->fmt.fmt.pix.height = rect.height;
        vpfe_dev->fmt.fmt.pix.bytesperline =
                ccdc_dev->hw_ops.get_line_length();
        vpfe_dev->fmt.fmt.pix.sizeimage =
                vpfe_dev->fmt.fmt.pix.bytesperline *
                vpfe_dev->fmt.fmt.pix.height;
        vpfe_dev->crop = rect;
        sel->r = rect;
unlock_out:
        mutex_unlock(&vpfe_dev->lock);
        return ret;
}

/* vpfe capture ioctl operations */
static const struct v4l2_ioctl_ops vpfe_ioctl_ops = {
        .vidioc_querycap         = vpfe_querycap,
        .vidioc_g_fmt_vid_cap    = vpfe_g_fmt_vid_cap,
        .vidioc_enum_fmt_vid_cap = vpfe_enum_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap    = vpfe_s_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap  = vpfe_try_fmt_vid_cap,
        .vidioc_enum_input       = vpfe_enum_input,
        .vidioc_g_input          = vpfe_g_input,
        .vidioc_s_input          = vpfe_s_input,
        .vidioc_querystd         = vpfe_querystd,
        .vidioc_s_std            = vpfe_s_std,
        .vidioc_g_std            = vpfe_g_std,
        .vidioc_reqbufs          = vpfe_reqbufs,
        .vidioc_querybuf         = vpfe_querybuf,
        .vidioc_qbuf             = vpfe_qbuf,
        .vidioc_dqbuf            = vpfe_dqbuf,
        .vidioc_streamon         = vpfe_streamon,
        .vidioc_streamoff        = vpfe_streamoff,
        .vidioc_g_pixelaspect    = vpfe_g_pixelaspect,
        .vidioc_g_selection      = vpfe_g_selection,
        .vidioc_s_selection      = vpfe_s_selection,
};

static struct vpfe_device *vpfe_initialize(void)
{
        struct vpfe_device *vpfe_dev;

        /* Default number of buffers should be 3 */
        if ((numbuffers > 0) &&
            (numbuffers < config_params.min_numbuffers))
                numbuffers = config_params.min_numbuffers;

        /*
         * Set buffer size to min buffers size if invalid buffer size is
         * given
         */
        if (bufsize < config_params.min_bufsize)
                bufsize = config_params.min_bufsize;

        config_params.numbuffers = numbuffers;

        if (numbuffers)
                config_params.device_bufsize = bufsize;

        /* Allocate memory for device objects */
        vpfe_dev = kzalloc(sizeof(*vpfe_dev), GFP_KERNEL);

        return vpfe_dev;
}

/*
 * vpfe_probe : This function creates device entries by register
 * itself to the V4L2 driver and initializes fields of each
 * device objects
 */
static int vpfe_probe(struct platform_device *pdev)
{
        struct vpfe_subdev_info *sdinfo;
        struct vpfe_config *vpfe_cfg;
        struct resource *res1;
        struct vpfe_device *vpfe_dev;
        struct i2c_adapter *i2c_adap;
        struct video_device *vfd;
        int ret, i, j;
        int num_subdevs = 0;

        /* Get the pointer to the device object */
        vpfe_dev = vpfe_initialize();

        if (!vpfe_dev) {
                v4l2_err(pdev->dev.driver,
                        "Failed to allocate memory for vpfe_dev\n");
                return -ENOMEM;
        }

        vpfe_dev->pdev = &pdev->dev;

        if (!pdev->dev.platform_data) {
                v4l2_err(pdev->dev.driver, "Unable to get vpfe config\n");
                ret = -ENODEV;
                goto probe_free_dev_mem;
        }

        vpfe_cfg = pdev->dev.platform_data;
        vpfe_dev->cfg = vpfe_cfg;
        if (!vpfe_cfg->ccdc || !vpfe_cfg->card_name || !vpfe_cfg->sub_devs) {
                v4l2_err(pdev->dev.driver, "null ptr in vpfe_cfg\n");
                ret = -ENOENT;
                goto probe_free_dev_mem;
        }

        /* Allocate memory for ccdc configuration */
        ccdc_cfg = kmalloc(sizeof(*ccdc_cfg), GFP_KERNEL);
        if (!ccdc_cfg) {
                ret = -ENOMEM;
                goto probe_free_dev_mem;
        }

        mutex_lock(&ccdc_lock);

        strscpy(ccdc_cfg->name, vpfe_cfg->ccdc, sizeof(ccdc_cfg->name));
        /* Get VINT0 irq resource */
        res1 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        if (!res1) {
                v4l2_err(pdev->dev.driver,
                         "Unable to get interrupt for VINT0\n");
                ret = -ENODEV;
                goto probe_free_ccdc_cfg_mem;
        }
        vpfe_dev->ccdc_irq0 = res1->start;

        /* Get VINT1 irq resource */
        res1 = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
        if (!res1) {
                v4l2_err(pdev->dev.driver,
                         "Unable to get interrupt for VINT1\n");
                ret = -ENODEV;
                goto probe_free_ccdc_cfg_mem;
        }
        vpfe_dev->ccdc_irq1 = res1->start;

        ret = request_irq(vpfe_dev->ccdc_irq0, vpfe_isr, 0,
                          "vpfe_capture0", vpfe_dev);

        if (0 != ret) {
                v4l2_err(pdev->dev.driver, "Unable to request interrupt\n");
                goto probe_free_ccdc_cfg_mem;
        }

        vfd = &vpfe_dev->video_dev;
        /* Initialize field of video device */
        vfd->release            = video_device_release_empty;
        vfd->fops               = &vpfe_fops;
        vfd->ioctl_ops          = &vpfe_ioctl_ops;
        vfd->tvnorms            = 0;
        vfd->v4l2_dev           = &vpfe_dev->v4l2_dev;
        snprintf(vfd->name, sizeof(vfd->name),
                 "%s_V%d.%d.%d",
                 CAPTURE_DRV_NAME,
                 (VPFE_CAPTURE_VERSION_CODE >> 16) & 0xff,
                 (VPFE_CAPTURE_VERSION_CODE >> 8) & 0xff,
                 (VPFE_CAPTURE_VERSION_CODE) & 0xff);

        ret = v4l2_device_register(&pdev->dev, &vpfe_dev->v4l2_dev);
        if (ret) {
                v4l2_err(pdev->dev.driver,
                        "Unable to register v4l2 device.\n");
                goto probe_out_release_irq;
        }
        v4l2_info(&vpfe_dev->v4l2_dev, "v4l2 device registered\n");
        spin_lock_init(&vpfe_dev->irqlock);
        spin_lock_init(&vpfe_dev->dma_queue_lock);
        mutex_init(&vpfe_dev->lock);

        /* Initialize field of the device objects */
        vpfe_dev->numbuffers = config_params.numbuffers;

        /* register video device */
        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
                "trying to register vpfe device.\n");
        v4l2_dbg(1, debug, &vpfe_dev->v4l2_dev,
                "video_dev=%p\n", &vpfe_dev->video_dev);
        vpfe_dev->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        ret = video_register_device(&vpfe_dev->video_dev,
                                    VFL_TYPE_GRABBER, -1);

        if (ret) {
                v4l2_err(pdev->dev.driver,
                        "Unable to register video device.\n");
                goto probe_out_v4l2_unregister;
        }

        v4l2_info(&vpfe_dev->v4l2_dev, "video device registered\n");
        /* set the driver data in platform device */
        platform_set_drvdata(pdev, vpfe_dev);
        /* set driver private data */
        video_set_drvdata(&vpfe_dev->video_dev, vpfe_dev);
        i2c_adap = i2c_get_adapter(vpfe_cfg->i2c_adapter_id);
        num_subdevs = vpfe_cfg->num_subdevs;
        vpfe_dev->sd = kmalloc_array(num_subdevs,
                                     sizeof(*vpfe_dev->sd),
                                     GFP_KERNEL);
        if (!vpfe_dev->sd) {
                ret = -ENOMEM;
                goto probe_out_video_unregister;
        }

        for (i = 0; i < num_subdevs; i++) {
                struct v4l2_input *inps;

                sdinfo = &vpfe_cfg->sub_devs[i];

                /* Load up the subdevice */
                vpfe_dev->sd[i] =
                        v4l2_i2c_new_subdev_board(&vpfe_dev->v4l2_dev,
                                                  i2c_adap,
                                                  &sdinfo->board_info,
                                                  NULL);
                if (vpfe_dev->sd[i]) {
                        v4l2_info(&vpfe_dev->v4l2_dev,
                                  "v4l2 sub device %s registered\n",
                                  sdinfo->name);
                        vpfe_dev->sd[i]->grp_id = sdinfo->grp_id;
                        /* update tvnorms from the sub devices */
                        for (j = 0; j < sdinfo->num_inputs; j++) {
                                inps = &sdinfo->inputs[j];
                                vfd->tvnorms |= inps->std;
                        }
                } else {
                        v4l2_info(&vpfe_dev->v4l2_dev,
                                  "v4l2 sub device %s register fails\n",
                                  sdinfo->name);
                        ret = -ENXIO;
                        goto probe_sd_out;
                }
        }

        /* set first sub device as current one */
        vpfe_dev->current_subdev = &vpfe_cfg->sub_devs[0];
        vpfe_dev->v4l2_dev.ctrl_handler = vpfe_dev->sd[0]->ctrl_handler;

        /* We have at least one sub device to work with */
        mutex_unlock(&ccdc_lock);
        return 0;

probe_sd_out:
        kfree(vpfe_dev->sd);
probe_out_video_unregister:
        video_unregister_device(&vpfe_dev->video_dev);
probe_out_v4l2_unregister:
        v4l2_device_unregister(&vpfe_dev->v4l2_dev);
probe_out_release_irq:
        free_irq(vpfe_dev->ccdc_irq0, vpfe_dev);
probe_free_ccdc_cfg_mem:
        kfree(ccdc_cfg);
        mutex_unlock(&ccdc_lock);
probe_free_dev_mem:
        kfree(vpfe_dev);
        return ret;
}

/*
 * vpfe_remove : It un-register device from V4L2 driver
 */
static int vpfe_remove(struct platform_device *pdev)
{
        struct vpfe_device *vpfe_dev = platform_get_drvdata(pdev);

        v4l2_info(pdev->dev.driver, "vpfe_remove\n");

        free_irq(vpfe_dev->ccdc_irq0, vpfe_dev);
        kfree(vpfe_dev->sd);
        v4l2_device_unregister(&vpfe_dev->v4l2_dev);
        video_unregister_device(&vpfe_dev->video_dev);
        kfree(vpfe_dev);
        kfree(ccdc_cfg);
        return 0;
}

static int vpfe_suspend(struct device *dev)
{
        return 0;
}

static int vpfe_resume(struct device *dev)
{
        return 0;
}

static const struct dev_pm_ops vpfe_dev_pm_ops = {
        .suspend = vpfe_suspend,
        .resume = vpfe_resume,
};

static struct platform_driver vpfe_driver = {
        .driver = {
                .name = CAPTURE_DRV_NAME,
                .pm = &vpfe_dev_pm_ops,
        },
        .probe = vpfe_probe,
        .remove = vpfe_remove,
};

module_platform_driver(vpfe_driver);