/*
 * vpif-display - VPIF display driver
 * Display driver for TI DaVinci VPIF
 *
 * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/string.h>
#include <linux/videodev2.h>
#include <linux/wait.h>
#include <linux/time.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/version.h>
#include <linux/slab.h>

#include <asm/irq.h>
#include <asm/page.h>

#include <media/adv7343.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-chip-ident.h>

#include <mach/dm646x.h>

#include "vpif_display.h"
#include "vpif.h"

MODULE_DESCRIPTION("TI DaVinci VPIF Display driver");
MODULE_LICENSE("GPL");

#define DM646X_V4L2_STD (V4L2_STD_525_60 | V4L2_STD_625_50)

#define vpif_err(fmt, arg...)   v4l2_err(&vpif_obj.v4l2_dev, fmt, ## arg)
#define vpif_dbg(level, debug, fmt, arg...)     \
                v4l2_dbg(level, debug, &vpif_obj.v4l2_dev, fmt, ## arg)

static int debug = 1;
static u32 ch2_numbuffers = 3;
static u32 ch3_numbuffers = 3;
static u32 ch2_bufsize = 1920 * 1080 * 2;
static u32 ch3_bufsize = 720 * 576 * 2;

module_param(debug, int, 0644);
module_param(ch2_numbuffers, uint, S_IRUGO);
module_param(ch3_numbuffers, uint, S_IRUGO);
module_param(ch2_bufsize, uint, S_IRUGO);
module_param(ch3_bufsize, uint, S_IRUGO);

MODULE_PARM_DESC(debug, "Debug level 0-1");
MODULE_PARM_DESC(ch2_numbuffers, "Channel2 buffer count (default:3)");
MODULE_PARM_DESC(ch3_numbuffers, "Channel3 buffer count (default:3)");
MODULE_PARM_DESC(ch2_bufsize, "Channel2 buffer size (default:1920 x 1080 x 2)");
MODULE_PARM_DESC(ch3_bufsize, "Channel3 buffer size (default:720 x 576 x 2)");

static struct vpif_config_params config_params = {
        .min_numbuffers         = 3,
        .numbuffers[0]          = 3,
        .numbuffers[1]          = 3,
        .min_bufsize[0]         = 720 * 480 * 2,
        .min_bufsize[1]         = 720 * 480 * 2,
        .channel_bufsize[0]     = 1920 * 1080 * 2,
        .channel_bufsize[1]     = 720 * 576 * 2,
};

static struct vpif_device vpif_obj = { {NULL} };
static struct device *vpif_dev;

/*
 * vpif_uservirt_to_phys: This function is used to convert user
 * space virtual address to physical address.
 */
static u32 vpif_uservirt_to_phys(u32 virtp)
{
        struct mm_struct *mm = current->mm;
        unsigned long physp = 0;
        struct vm_area_struct *vma;

        vma = find_vma(mm, virtp);

        /* For kernel direct-mapped memory, take the easy way */
        if (virtp >= PAGE_OFFSET) {
                physp = virt_to_phys((void *)virtp);
        } else if (vma && (vma->vm_flags & VM_IO) && (vma->vm_pgoff)) {
                /* this will catch, kernel-allocated, mmaped-to-usermode addr */
                physp = (vma->vm_pgoff << PAGE_SHIFT) + (virtp - vma->vm_start);
        } else {
                /* otherwise, use get_user_pages() for general userland pages */
                int res, nr_pages = 1;
                struct page *pages;
                down_read(&current->mm->mmap_sem);

                res = get_user_pages(current, current->mm,
                                     virtp, nr_pages, 1, 0, &pages, NULL);
                up_read(&current->mm->mmap_sem);

                if (res == nr_pages) {
                        physp = __pa(page_address(&pages[0]) +
                                                        (virtp & ~PAGE_MASK));
                } else {
                        vpif_err("get_user_pages failed\n");
                        return 0;
                }
        }

        return physp;
}

/*
 * buffer_prepare: This is the callback function called from videobuf_qbuf()
 * function the buffer is prepared and user space virtual address is converted
 * into physical address
 */
static int vpif_buffer_prepare(struct videobuf_queue *q,
                               struct videobuf_buffer *vb,
                               enum v4l2_field field)
{
        struct vpif_fh *fh = q->priv_data;
        struct common_obj *common;
        unsigned long addr;

        common = &fh->channel->common[VPIF_VIDEO_INDEX];
        if (VIDEOBUF_NEEDS_INIT == vb->state) {
                vb->width       = common->width;
                vb->height      = common->height;
                vb->size        = vb->width * vb->height;
                vb->field       = field;
        }
        vb->state = VIDEOBUF_PREPARED;

        /* if user pointer memory mechanism is used, get the physical
         * address of the buffer */
        if (V4L2_MEMORY_USERPTR == common->memory) {
                if (!vb->baddr) {
                        vpif_err("buffer_address is 0\n");
                        return -EINVAL;
                }

                vb->boff = vpif_uservirt_to_phys(vb->baddr);
                if (!ISALIGNED(vb->boff))
                        goto buf_align_exit;
        }

        addr = vb->boff;
        if (q->streaming && (V4L2_BUF_TYPE_SLICED_VBI_OUTPUT != q->type)) {
                if (!ISALIGNED(addr + common->ytop_off) ||
                    !ISALIGNED(addr + common->ybtm_off) ||
                    !ISALIGNED(addr + common->ctop_off) ||
                    !ISALIGNED(addr + common->cbtm_off))
                        goto buf_align_exit;
        }
        return 0;

buf_align_exit:
        vpif_err("buffer offset not aligned to 8 bytes\n");
        return -EINVAL;
}

/*
 * vpif_buffer_setup: This function allocates memory for the buffers
 */
static int vpif_buffer_setup(struct videobuf_queue *q, unsigned int *count,
                                unsigned int *size)
{
        struct vpif_fh *fh = q->priv_data;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        if (V4L2_MEMORY_MMAP != common->memory)
                return 0;

        *size = config_params.channel_bufsize[ch->channel_id];
        if (*count < config_params.min_numbuffers)
                *count = config_params.min_numbuffers;

        return 0;
}

/*
 * vpif_buffer_queue: This function adds the buffer to DMA queue
 */
static void vpif_buffer_queue(struct videobuf_queue *q,
                              struct videobuf_buffer *vb)
{
        struct vpif_fh *fh = q->priv_data;
        struct common_obj *common;

        common = &fh->channel->common[VPIF_VIDEO_INDEX];

        /* add the buffer to the DMA queue */
        list_add_tail(&vb->queue, &common->dma_queue);
        vb->state = VIDEOBUF_QUEUED;
}

/*
 * vpif_buffer_release: This function is called from the videobuf layer to
 * free memory allocated to the buffers
 */
static void vpif_buffer_release(struct videobuf_queue *q,
                                struct videobuf_buffer *vb)
{
        struct vpif_fh *fh = q->priv_data;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common;
        unsigned int buf_size = 0;

        common = &ch->common[VPIF_VIDEO_INDEX];

        videobuf_dma_contig_free(q, vb);
        vb->state = VIDEOBUF_NEEDS_INIT;

        if (V4L2_MEMORY_MMAP != common->memory)
                return;

        buf_size = config_params.channel_bufsize[ch->channel_id];
}

static struct videobuf_queue_ops video_qops = {
        .buf_setup      = vpif_buffer_setup,
        .buf_prepare    = vpif_buffer_prepare,
        .buf_queue      = vpif_buffer_queue,
        .buf_release    = vpif_buffer_release,
};
static u8 channel_first_int[VPIF_NUMOBJECTS][2] = { {1, 1} };

static void process_progressive_mode(struct common_obj *common)
{
        unsigned long addr = 0;

        /* Get the next buffer from buffer queue */
        common->next_frm = list_entry(common->dma_queue.next,
                                struct videobuf_buffer, queue);
        /* Remove that buffer from the buffer queue */
        list_del(&common->next_frm->queue);
        /* Mark status of the buffer as active */
        common->next_frm->state = VIDEOBUF_ACTIVE;

        /* Set top and bottom field addrs in VPIF registers */
        addr = videobuf_to_dma_contig(common->next_frm);
        common->set_addr(addr + common->ytop_off,
                                 addr + common->ybtm_off,
                                 addr + common->ctop_off,
                                 addr + common->cbtm_off);
}

static void process_interlaced_mode(int fid, struct common_obj *common)
{
        /* device field id and local field id are in sync */
        /* If this is even field */
        if (0 == fid) {
                if (common->cur_frm == common->next_frm)
                        return;

                /* one frame is displayed If next frame is
                 *  available, release cur_frm and move on */
                /* Copy frame display time */
                do_gettimeofday(&common->cur_frm->ts);
                /* Change status of the cur_frm */
                common->cur_frm->state = VIDEOBUF_DONE;
                /* unlock semaphore on cur_frm */
                wake_up_interruptible(&common->cur_frm->done);
                /* Make cur_frm pointing to next_frm */
                common->cur_frm = common->next_frm;

        } else if (1 == fid) {  /* odd field */
                if (list_empty(&common->dma_queue)
                    || (common->cur_frm != common->next_frm)) {
                        return;
                }
                /* one field is displayed configure the next
                 * frame if it is available else hold on current
                 * frame */
                /* Get next from the buffer queue */
                process_progressive_mode(common);

        }
}

/*
 * vpif_channel_isr: It changes status of the displayed buffer, takes next
 * buffer from the queue and sets its address in VPIF registers
 */
static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
{
        struct vpif_device *dev = &vpif_obj;
        struct channel_obj *ch;
        struct common_obj *common;
        enum v4l2_field field;
        int fid = -1, i;
        int channel_id = 0;

        channel_id = *(int *)(dev_id);
        ch = dev->dev[channel_id];
        field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;
        for (i = 0; i < VPIF_NUMOBJECTS; i++) {
                common = &ch->common[i];
                /* If streaming is started in this channel */
                if (0 == common->started)
                        continue;

                if (1 == ch->vpifparams.std_info.frm_fmt) {
                        if (list_empty(&common->dma_queue))
                                continue;

                        /* Progressive mode */
                        if (!channel_first_int[i][channel_id]) {
                                /* Mark status of the cur_frm to
                                 * done and unlock semaphore on it */
                                do_gettimeofday(&common->cur_frm->ts);
                                common->cur_frm->state = VIDEOBUF_DONE;
                                wake_up_interruptible(&common->cur_frm->done);
                                /* Make cur_frm pointing to next_frm */
                                common->cur_frm = common->next_frm;
                        }

                        channel_first_int[i][channel_id] = 0;
                        process_progressive_mode(common);
                } else {
                        /* Interlaced mode */
                        /* If it is first interrupt, ignore it */

                        if (channel_first_int[i][channel_id]) {
                                channel_first_int[i][channel_id] = 0;
                                continue;
                        }

                        if (0 == i) {
                                ch->field_id ^= 1;
                                /* Get field id from VPIF registers */
                                fid = vpif_channel_getfid(ch->channel_id + 2);
                                /* If fid does not match with stored field id */
                                if (fid != ch->field_id) {
                                        /* Make them in sync */
                                        if (0 == fid)
                                                ch->field_id = fid;

                                        return IRQ_HANDLED;
                                }
                        }
                        process_interlaced_mode(fid, common);
                }
        }

        return IRQ_HANDLED;
}

static int vpif_update_std_info(struct channel_obj *ch)
{
        struct video_obj *vid_ch = &ch->video;
        struct vpif_params *vpifparams = &ch->vpifparams;
        struct vpif_channel_config_params *std_info = &vpifparams->std_info;
        const struct vpif_channel_config_params *config;

        int i;

        for (i = 0; i < vpif_ch_params_count; i++) {
                config = &ch_params[i];
                if (config->hd_sd == 0) {
                        vpif_dbg(2, debug, "SD format\n");
                        if (config->stdid & vid_ch->stdid) {
                                memcpy(std_info, config, sizeof(*config));
                                break;
                        }
                } else {
                        vpif_dbg(2, debug, "HD format\n");
                        if (config->dv_preset == vid_ch->dv_preset) {
                                memcpy(std_info, config, sizeof(*config));
                                break;
                        }
                }
        }

        if (i == vpif_ch_params_count) {
                vpif_dbg(1, debug, "Format not found\n");
                return -EINVAL;
        }

        return 0;
}

static int vpif_update_resolution(struct channel_obj *ch)
{
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct video_obj *vid_ch = &ch->video;
        struct vpif_params *vpifparams = &ch->vpifparams;
        struct vpif_channel_config_params *std_info = &vpifparams->std_info;

        if (!vid_ch->stdid && !vid_ch->dv_preset && !vid_ch->bt_timings.height)
                return -EINVAL;

        if (vid_ch->stdid || vid_ch->dv_preset) {
                if (vpif_update_std_info(ch))
                        return -EINVAL;
        }

        common->fmt.fmt.pix.width = std_info->width;
        common->fmt.fmt.pix.height = std_info->height;
        vpif_dbg(1, debug, "Pixel details: Width = %d,Height = %d\n",
                        common->fmt.fmt.pix.width, common->fmt.fmt.pix.height);

        /* Set height and width paramateres */
        common->height = std_info->height;
        common->width = std_info->width;

        return 0;
}

/*
 * vpif_calculate_offsets: This function calculates buffers offset for Y and C
 * in the top and bottom field
 */
static void vpif_calculate_offsets(struct channel_obj *ch)
{
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct vpif_params *vpifparams = &ch->vpifparams;
        enum v4l2_field field = common->fmt.fmt.pix.field;
        struct video_obj *vid_ch = &ch->video;
        unsigned int hpitch, vpitch, sizeimage;

        if (V4L2_FIELD_ANY == common->fmt.fmt.pix.field) {
                if (ch->vpifparams.std_info.frm_fmt)
                        vid_ch->buf_field = V4L2_FIELD_NONE;
                else
                        vid_ch->buf_field = V4L2_FIELD_INTERLACED;
        } else {
                vid_ch->buf_field = common->fmt.fmt.pix.field;
        }

        if (V4L2_MEMORY_USERPTR == common->memory)
                sizeimage = common->fmt.fmt.pix.sizeimage;
        else
                sizeimage = config_params.channel_bufsize[ch->channel_id];

        hpitch = common->fmt.fmt.pix.bytesperline;
        vpitch = sizeimage / (hpitch * 2);
        if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
            (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
                common->ytop_off = 0;
                common->ybtm_off = hpitch;
                common->ctop_off = sizeimage / 2;
                common->cbtm_off = sizeimage / 2 + hpitch;
        } else if (V4L2_FIELD_SEQ_TB == vid_ch->buf_field) {
                common->ytop_off = 0;
                common->ybtm_off = sizeimage / 4;
                common->ctop_off = sizeimage / 2;
                common->cbtm_off = common->ctop_off + sizeimage / 4;
        } else if (V4L2_FIELD_SEQ_BT == vid_ch->buf_field) {
                common->ybtm_off = 0;
                common->ytop_off = sizeimage / 4;
                common->cbtm_off = sizeimage / 2;
                common->ctop_off = common->cbtm_off + sizeimage / 4;
        }

        if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
            (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
                vpifparams->video_params.storage_mode = 1;
        } else {
                vpifparams->video_params.storage_mode = 0;
        }

        if (ch->vpifparams.std_info.frm_fmt == 1) {
                vpifparams->video_params.hpitch =
                    common->fmt.fmt.pix.bytesperline;
        } else {
                if ((field == V4L2_FIELD_ANY) ||
                        (field == V4L2_FIELD_INTERLACED))
                        vpifparams->video_params.hpitch =
                            common->fmt.fmt.pix.bytesperline * 2;
                else
                        vpifparams->video_params.hpitch =
                            common->fmt.fmt.pix.bytesperline;
        }

        ch->vpifparams.video_params.stdid = ch->vpifparams.std_info.stdid;
}

static void vpif_config_format(struct channel_obj *ch)
{
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        common->fmt.fmt.pix.field = V4L2_FIELD_ANY;
        if (config_params.numbuffers[ch->channel_id] == 0)
                common->memory = V4L2_MEMORY_USERPTR;
        else
                common->memory = V4L2_MEMORY_MMAP;

        common->fmt.fmt.pix.sizeimage =
                        config_params.channel_bufsize[ch->channel_id];
        common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
        common->fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
}

static int vpif_check_format(struct channel_obj *ch,
                             struct v4l2_pix_format *pixfmt)
{
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        enum v4l2_field field = pixfmt->field;
        u32 sizeimage, hpitch, vpitch;

        if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
                goto invalid_fmt_exit;

        if (!(VPIF_VALID_FIELD(field)))
                goto invalid_fmt_exit;

        if (pixfmt->bytesperline <= 0)
                goto invalid_pitch_exit;

        if (V4L2_MEMORY_USERPTR == common->memory)
                sizeimage = pixfmt->sizeimage;
        else
                sizeimage = config_params.channel_bufsize[ch->channel_id];

        if (vpif_update_resolution(ch))
                return -EINVAL;

        hpitch = pixfmt->bytesperline;
        vpitch = sizeimage / (hpitch * 2);

        /* Check for valid value of pitch */
        if ((hpitch < ch->vpifparams.std_info.width) ||
            (vpitch < ch->vpifparams.std_info.height))
                goto invalid_pitch_exit;

        /* Check for 8 byte alignment */
        if (!ISALIGNED(hpitch)) {
                vpif_err("invalid pitch alignment\n");
                return -EINVAL;
        }
        pixfmt->width = common->fmt.fmt.pix.width;
        pixfmt->height = common->fmt.fmt.pix.height;

        return 0;

invalid_fmt_exit:
        vpif_err("invalid field format\n");
        return -EINVAL;

invalid_pitch_exit:
        vpif_err("invalid pitch\n");
        return -EINVAL;
}

static void vpif_config_addr(struct channel_obj *ch, int muxmode)
{
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        if (VPIF_CHANNEL3_VIDEO == ch->channel_id) {
                common->set_addr = ch3_set_videobuf_addr;
        } else {
                if (2 == muxmode)
                        common->set_addr = ch2_set_videobuf_addr_yc_nmux;
                else
                        common->set_addr = ch2_set_videobuf_addr;
        }
}

/*
 * vpif_mmap: It is used to map kernel space buffers into user spaces
 */
static int vpif_mmap(struct file *filep, struct vm_area_struct *vma)
{
        struct vpif_fh *fh = filep->private_data;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]);

        vpif_dbg(2, debug, "vpif_mmap\n");

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

/*
 * vpif_poll: It is used for select/poll system call
 */
static unsigned int vpif_poll(struct file *filep, poll_table *wait)
{
        struct vpif_fh *fh = filep->private_data;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        if (common->started)
                return videobuf_poll_stream(filep, &common->buffer_queue, wait);

        return 0;
}

/*
 * vpif_open: It creates object of file handle structure and stores it in
 * private_data member of filepointer
 */
static int vpif_open(struct file *filep)
{
        struct video_device *vdev = video_devdata(filep);
        struct channel_obj *ch = NULL;
        struct vpif_fh *fh = NULL;

        ch = video_get_drvdata(vdev);
        /* Allocate memory for the file handle object */
        fh = kzalloc(sizeof(struct vpif_fh), GFP_KERNEL);
        if (fh == NULL) {
                vpif_err("unable to allocate memory for file handle object\n");
                return -ENOMEM;
        }

        /* store pointer to fh in private_data member of filep */
        filep->private_data = fh;
        fh->channel = ch;
        fh->initialized = 0;
        if (!ch->initialized) {
                fh->initialized = 1;
                ch->initialized = 1;
                memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));
        }

        /* Increment channel usrs counter */
        atomic_inc(&ch->usrs);
        /* Set io_allowed[VPIF_VIDEO_INDEX] member to false */
        fh->io_allowed[VPIF_VIDEO_INDEX] = 0;
        /* Initialize priority of this instance to default priority */
        fh->prio = V4L2_PRIORITY_UNSET;
        v4l2_prio_open(&ch->prio, &fh->prio);

        return 0;
}

/*
 * vpif_release: This function deletes buffer queue, frees the buffers and
 * the vpif file handle
 */
static int vpif_release(struct file *filep)
{
        struct vpif_fh *fh = filep->private_data;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        /* if this instance is doing IO */
        if (fh->io_allowed[VPIF_VIDEO_INDEX]) {
                /* Reset io_usrs member of channel object */
                common->io_usrs = 0;
                /* Disable channel */
                if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
                        enable_channel2(0);
                        channel2_intr_enable(0);
                }
                if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
                    (2 == common->started)) {
                        enable_channel3(0);
                        channel3_intr_enable(0);
                }
                common->started = 0;
                /* Free buffers allocated */
                videobuf_queue_cancel(&common->buffer_queue);
                videobuf_mmap_free(&common->buffer_queue);
                common->numbuffers =
                    config_params.numbuffers[ch->channel_id];
        }

        /* Decrement channel usrs counter */
        atomic_dec(&ch->usrs);
        /* If this file handle has initialize encoder device, reset it */
        if (fh->initialized)
                ch->initialized = 0;

        /* Close the priority */
        v4l2_prio_close(&ch->prio, fh->prio);
        filep->private_data = NULL;
        fh->initialized = 0;
        kfree(fh);

        return 0;
}

/* functions implementing ioctls */
/**
 * vpif_querycap() - QUERYCAP handler
 * @file: file ptr
 * @priv: file handle
 * @cap: ptr to v4l2_capability structure
 */
static int vpif_querycap(struct file *file, void  *priv,
                                struct v4l2_capability *cap)
{
        struct vpif_display_config *config = vpif_dev->platform_data;

        cap->version = VPIF_DISPLAY_VERSION_CODE;
        cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
        strlcpy(cap->driver, "vpif display", sizeof(cap->driver));
        strlcpy(cap->bus_info, "Platform", sizeof(cap->bus_info));
        strlcpy(cap->card, config->card_name, sizeof(cap->card));

        return 0;
}

static int vpif_enum_fmt_vid_out(struct file *file, void  *priv,
                                        struct v4l2_fmtdesc *fmt)
{
        if (fmt->index != 0) {
                vpif_err("Invalid format index\n");
                return -EINVAL;
        }

        /* Fill in the information about format */
        fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
        fmt->pixelformat = V4L2_PIX_FMT_YUV422P;

        return 0;
}

static int vpif_g_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        /* Check the validity of the buffer type */
        if (common->fmt.type != fmt->type)
                return -EINVAL;

        if (vpif_update_resolution(ch))
                return -EINVAL;
        *fmt = common->fmt;
        return 0;
}

static int vpif_s_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct vpif_fh *fh = priv;
        struct v4l2_pix_format *pixfmt;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        int ret = 0;

        if ((VPIF_CHANNEL2_VIDEO == ch->channel_id)
            || (VPIF_CHANNEL3_VIDEO == ch->channel_id)) {
                if (!fh->initialized) {
                        vpif_dbg(1, debug, "Channel Busy\n");
                        return -EBUSY;
                }

                /* Check for the priority */
                ret = v4l2_prio_check(&ch->prio, fh->prio);
                if (0 != ret)
                        return ret;
                fh->initialized = 1;
        }

        if (common->started) {
                vpif_dbg(1, debug, "Streaming in progress\n");
                return -EBUSY;
        }

        pixfmt = &fmt->fmt.pix;
        /* Check for valid field format */
        ret = vpif_check_format(ch, pixfmt);
        if (ret)
                return ret;

        /* store the pix format in the channel object */
        common->fmt.fmt.pix = *pixfmt;
        /* store the format in the channel object */
        common->fmt = *fmt;
        return 0;
}

static int vpif_try_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
        int ret = 0;

        ret = vpif_check_format(ch, pixfmt);
        if (ret) {
                *pixfmt = common->fmt.fmt.pix;
                pixfmt->sizeimage = pixfmt->width * pixfmt->height * 2;
        }

        return ret;
}

static int vpif_reqbufs(struct file *file, void *priv,
                        struct v4l2_requestbuffers *reqbuf)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common;
        enum v4l2_field field;
        u8 index = 0;

        /* This file handle has not initialized the channel,
           It is not allowed to do settings */
        if ((VPIF_CHANNEL2_VIDEO == ch->channel_id)
            || (VPIF_CHANNEL3_VIDEO == ch->channel_id)) {
                if (!fh->initialized) {
                        vpif_err("Channel Busy\n");
                        return -EBUSY;
                }
        }

        if (V4L2_BUF_TYPE_VIDEO_OUTPUT != reqbuf->type)
                return -EINVAL;

        index = VPIF_VIDEO_INDEX;

        common = &ch->common[index];

        if (common->fmt.type != reqbuf->type)
                return -EINVAL;

        if (0 != common->io_usrs)
                return -EBUSY;

        if (reqbuf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                if (common->fmt.fmt.pix.field == V4L2_FIELD_ANY)
                        field = V4L2_FIELD_INTERLACED;
                else
                        field = common->fmt.fmt.pix.field;
        } else {
                field = V4L2_VBI_INTERLACED;
        }

        /* Initialize videobuf queue as per the buffer type */
        videobuf_queue_dma_contig_init(&common->buffer_queue,
                                            &video_qops, NULL,
                                            &common->irqlock,
                                            reqbuf->type, field,
                                            sizeof(struct videobuf_buffer), fh,
                                            &common->lock);

        /* Set io allowed member of file handle to TRUE */
        fh->io_allowed[index] = 1;
        /* Increment io usrs member of channel object to 1 */
        common->io_usrs = 1;
        /* Store type of memory requested in channel object */
        common->memory = reqbuf->memory;
        INIT_LIST_HEAD(&common->dma_queue);

        /* Allocate buffers */
        return videobuf_reqbufs(&common->buffer_queue, reqbuf);
}

static int vpif_querybuf(struct file *file, void *priv,
                                struct v4l2_buffer *tbuf)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        if (common->fmt.type != tbuf->type)
                return -EINVAL;

        return videobuf_querybuf(&common->buffer_queue, tbuf);
}

static int vpif_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
{

        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct v4l2_buffer tbuf = *buf;
        struct videobuf_buffer *buf1;
        unsigned long addr = 0;
        unsigned long flags;
        int ret = 0;

        if (common->fmt.type != tbuf.type)
                return -EINVAL;

        if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
                vpif_err("fh->io_allowed\n");
                return -EACCES;
        }

        if (!(list_empty(&common->dma_queue)) ||
            (common->cur_frm != common->next_frm) ||
            !(common->started) ||
            (common->started && (0 == ch->field_id)))
                return videobuf_qbuf(&common->buffer_queue, buf);

        /* bufferqueue is empty store buffer address in VPIF registers */
        mutex_lock(&common->buffer_queue.vb_lock);
        buf1 = common->buffer_queue.bufs[tbuf.index];
        if (buf1->memory != tbuf.memory) {
                vpif_err("invalid buffer type\n");
                goto qbuf_exit;
        }

        if ((buf1->state == VIDEOBUF_QUEUED) ||
            (buf1->state == VIDEOBUF_ACTIVE)) {
                vpif_err("invalid state\n");
                goto qbuf_exit;
        }

        switch (buf1->memory) {
        case V4L2_MEMORY_MMAP:
                if (buf1->baddr == 0)
                        goto qbuf_exit;
                break;

        case V4L2_MEMORY_USERPTR:
                if (tbuf.length < buf1->bsize)
                        goto qbuf_exit;

                if ((VIDEOBUF_NEEDS_INIT != buf1->state)
                            && (buf1->baddr != tbuf.m.userptr)) {
                        vpif_buffer_release(&common->buffer_queue, buf1);
                        buf1->baddr = tbuf.m.userptr;
                }
                break;

        default:
                goto qbuf_exit;
        }

        local_irq_save(flags);
        ret = vpif_buffer_prepare(&common->buffer_queue, buf1,
                                        common->buffer_queue.field);
        if (ret < 0) {
                local_irq_restore(flags);
                goto qbuf_exit;
        }

        buf1->state = VIDEOBUF_ACTIVE;
        addr = buf1->boff;
        common->next_frm = buf1;
        if (tbuf.type != V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
                common->set_addr((addr + common->ytop_off),
                                 (addr + common->ybtm_off),
                                 (addr + common->ctop_off),
                                 (addr + common->cbtm_off));
        }

        local_irq_restore(flags);
        list_add_tail(&buf1->stream, &common->buffer_queue.stream);
        mutex_unlock(&common->buffer_queue.vb_lock);
        return 0;

qbuf_exit:
        mutex_unlock(&common->buffer_queue.vb_lock);
        return -EINVAL;
}

static int vpif_s_std(struct file *file, void *priv, v4l2_std_id *std_id)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        int ret = 0;

        if (!(*std_id & DM646X_V4L2_STD))
                return -EINVAL;

        if (common->started) {
                vpif_err("streaming in progress\n");
                return -EBUSY;
        }

        /* Call encoder subdevice function to set the standard */
        ch->video.stdid = *std_id;
        ch->video.dv_preset = V4L2_DV_INVALID;
        memset(&ch->video.bt_timings, 0, sizeof(ch->video.bt_timings));

        /* Get the information about the standard */
        if (vpif_update_resolution(ch))
                return -EINVAL;

        if ((ch->vpifparams.std_info.width *
                ch->vpifparams.std_info.height * 2) >
                config_params.channel_bufsize[ch->channel_id]) {
                vpif_err("invalid std for this size\n");
                return -EINVAL;
        }

        common->fmt.fmt.pix.bytesperline = common->fmt.fmt.pix.width;
        /* Configure the default format information */

        vpif_config_format(ch);

        ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
                                                s_std_output, *std_id);
        if (ret < 0) {
                vpif_err("Failed to set output standard\n");
                return ret;
        }

        ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, core,
                                                        s_std, *std_id);
        if (ret < 0)
                vpif_err("Failed to set standard for sub devices\n");
        return ret;
}

static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;

        *std = ch->video.stdid;
        return 0;
}

static int vpif_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        return videobuf_dqbuf(&common->buffer_queue, p,
                                        (file->f_flags & O_NONBLOCK));
}

static int vpif_streamon(struct file *file, void *priv,
                                enum v4l2_buf_type buftype)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct channel_obj *oth_ch = vpif_obj.dev[!ch->channel_id];
        struct vpif_params *vpif = &ch->vpifparams;
        struct vpif_display_config *vpif_config_data =
                                        vpif_dev->platform_data;
        unsigned long addr = 0;
        int ret = 0;

        if (buftype != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                vpif_err("buffer type not supported\n");
                return -EINVAL;
        }

        if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
                vpif_err("fh->io_allowed\n");
                return -EACCES;
        }

        /* If Streaming is already started, return error */
        if (common->started) {
                vpif_err("channel->started\n");
                return -EBUSY;
        }

        if ((ch->channel_id == VPIF_CHANNEL2_VIDEO
                && oth_ch->common[VPIF_VIDEO_INDEX].started &&
                ch->vpifparams.std_info.ycmux_mode == 0)
                || ((ch->channel_id == VPIF_CHANNEL3_VIDEO)
                && (2 == oth_ch->common[VPIF_VIDEO_INDEX].started))) {
                vpif_err("other channel is using\n");
                return -EBUSY;
        }

        ret = vpif_check_format(ch, &common->fmt.fmt.pix);
        if (ret < 0)
                return ret;

        /* Call videobuf_streamon to start streaming in videobuf */
        ret = videobuf_streamon(&common->buffer_queue);
        if (ret < 0) {
                vpif_err("videobuf_streamon\n");
                return ret;
        }

        /* If buffer queue is empty, return error */
        if (list_empty(&common->dma_queue)) {
                vpif_err("buffer queue is empty\n");
                return -EIO;
        }

        /* Get the next frame from the buffer queue */
        common->next_frm = common->cur_frm =
                            list_entry(common->dma_queue.next,
                                       struct videobuf_buffer, queue);

        list_del(&common->cur_frm->queue);
        /* Mark state of the current frame to active */
        common->cur_frm->state = VIDEOBUF_ACTIVE;

        /* Initialize field_id and started member */
        ch->field_id = 0;
        common->started = 1;
        if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                addr = common->cur_frm->boff;
                /* Calculate the offset for Y and C data  in the buffer */
                vpif_calculate_offsets(ch);

                if ((ch->vpifparams.std_info.frm_fmt &&
                        ((common->fmt.fmt.pix.field != V4L2_FIELD_NONE)
                        && (common->fmt.fmt.pix.field != V4L2_FIELD_ANY)))
                        || (!ch->vpifparams.std_info.frm_fmt
                        && (common->fmt.fmt.pix.field == V4L2_FIELD_NONE))) {
                        vpif_err("conflict in field format and std format\n");
                        return -EINVAL;
                }

                /* clock settings */
                ret =
                 vpif_config_data->set_clock(ch->vpifparams.std_info.ycmux_mode,
                                                ch->vpifparams.std_info.hd_sd);
                if (ret < 0) {
                        vpif_err("can't set clock\n");
                        return ret;
                }

                /* set the parameters and addresses */
                ret = vpif_set_video_params(vpif, ch->channel_id + 2);
                if (ret < 0)
                        return ret;

                common->started = ret;
                vpif_config_addr(ch, ret);
                common->set_addr((addr + common->ytop_off),
                                 (addr + common->ybtm_off),
                                 (addr + common->ctop_off),
                                 (addr + common->cbtm_off));

                /* Set interrupt for both the fields in VPIF
                   Register enable channel in VPIF register */
                if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
                        channel2_intr_assert();
                        channel2_intr_enable(1);
                        enable_channel2(1);
                }

                if ((VPIF_CHANNEL3_VIDEO == ch->channel_id)
                        || (common->started == 2)) {
                        channel3_intr_assert();
                        channel3_intr_enable(1);
                        enable_channel3(1);
                }
                channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
        }
        return ret;
}

static int vpif_streamoff(struct file *file, void *priv,
                                enum v4l2_buf_type buftype)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

        if (buftype != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                vpif_err("buffer type not supported\n");
                return -EINVAL;
        }

        if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
                vpif_err("fh->io_allowed\n");
                return -EACCES;
        }

        if (!common->started) {
                vpif_err("channel->started\n");
                return -EINVAL;
        }

        if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
                /* disable channel */
                if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
                        enable_channel2(0);
                        channel2_intr_enable(0);
                }
                if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
                                        (2 == common->started)) {
                        enable_channel3(0);
                        channel3_intr_enable(0);
                }
        }

        common->started = 0;
        return videobuf_streamoff(&common->buffer_queue);
}

static int vpif_cropcap(struct file *file, void *priv,
                        struct v4l2_cropcap *crop)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        if (V4L2_BUF_TYPE_VIDEO_OUTPUT != crop->type)
                return -EINVAL;

        crop->bounds.left = crop->bounds.top = 0;
        crop->defrect.left = crop->defrect.top = 0;
        crop->defrect.height = crop->bounds.height = common->height;
        crop->defrect.width = crop->bounds.width = common->width;

        return 0;
}

static int vpif_enum_output(struct file *file, void *fh,
                                struct v4l2_output *output)
{

        struct vpif_display_config *config = vpif_dev->platform_data;

        if (output->index >= config->output_count) {
                vpif_dbg(1, debug, "Invalid output index\n");
                return -EINVAL;
        }

        strcpy(output->name, config->output[output->index]);
        output->type = V4L2_OUTPUT_TYPE_ANALOG;
        output->std = DM646X_V4L2_STD;

        return 0;
}

static int vpif_s_output(struct file *file, void *priv, unsigned int i)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        int ret = 0;

        if (common->started) {
                vpif_err("Streaming in progress\n");
                return -EBUSY;
        }

        ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
                                                        s_routing, 0, i, 0);

        if (ret < 0)
                vpif_err("Failed to set output standard\n");

        vid_ch->output_id = i;
        return ret;
}

static int vpif_g_output(struct file *file, void *priv, unsigned int *i)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;

        *i = vid_ch->output_id;

        return 0;
}

static int vpif_g_priority(struct file *file, void *priv, enum v4l2_priority *p)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;

        *p = v4l2_prio_max(&ch->prio);

        return 0;
}

static int vpif_s_priority(struct file *file, void *priv, enum v4l2_priority p)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;

        return v4l2_prio_change(&ch->prio, &fh->prio, p);
}

/**
 * vpif_enum_dv_presets() - ENUM_DV_PRESETS handler
 * @file: file ptr
 * @priv: file handle
 * @preset: input preset
 */
static int vpif_enum_dv_presets(struct file *file, void *priv,
                struct v4l2_dv_enum_preset *preset)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;

        return v4l2_subdev_call(vpif_obj.sd[vid_ch->output_id],
                        video, enum_dv_presets, preset);
}

/**
 * vpif_s_dv_presets() - S_DV_PRESETS handler
 * @file: file ptr
 * @priv: file handle
 * @preset: input preset
 */
static int vpif_s_dv_preset(struct file *file, void *priv,
                struct v4l2_dv_preset *preset)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct video_obj *vid_ch = &ch->video;
        int ret = 0;

        if (common->started) {
                vpif_dbg(1, debug, "streaming in progress\n");
                return -EBUSY;
        }

        ret = v4l2_prio_check(&ch->prio, fh->prio);
        if (ret != 0)
                return ret;

        fh->initialized = 1;

        /* Call encoder subdevice function to set the standard */
        if (mutex_lock_interruptible(&common->lock))
                return -ERESTARTSYS;

        ch->video.dv_preset = preset->preset;
        ch->video.stdid = V4L2_STD_UNKNOWN;
        memset(&ch->video.bt_timings, 0, sizeof(ch->video.bt_timings));

        /* Get the information about the standard */
        if (vpif_update_resolution(ch)) {
                ret = -EINVAL;
        } else {
                /* Configure the default format information */
                vpif_config_format(ch);

                ret = v4l2_subdev_call(vpif_obj.sd[vid_ch->output_id],
                                video, s_dv_preset, preset);
        }

        mutex_unlock(&common->lock);

        return ret;
}
/**
 * vpif_g_dv_presets() - G_DV_PRESETS handler
 * @file: file ptr
 * @priv: file handle
 * @preset: input preset
 */
static int vpif_g_dv_preset(struct file *file, void *priv,
                struct v4l2_dv_preset *preset)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;

        preset->preset = ch->video.dv_preset;

        return 0;
}
/**
 * vpif_s_dv_timings() - S_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: digital video timings
 */
static int vpif_s_dv_timings(struct file *file, void *priv,
                struct v4l2_dv_timings *timings)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct vpif_params *vpifparams = &ch->vpifparams;
        struct vpif_channel_config_params *std_info = &vpifparams->std_info;
        struct video_obj *vid_ch = &ch->video;
        struct v4l2_bt_timings *bt = &vid_ch->bt_timings;
        int ret;

        if (timings->type != V4L2_DV_BT_656_1120) {
                vpif_dbg(2, debug, "Timing type not defined\n");
                return -EINVAL;
        }

        /* Configure subdevice timings, if any */
        ret = v4l2_subdev_call(vpif_obj.sd[vid_ch->output_id],
                        video, s_dv_timings, timings);
        if (ret == -ENOIOCTLCMD) {
                vpif_dbg(2, debug, "Custom DV timings not supported by "
                                "subdevice\n");
                return -EINVAL;
        }
        if (ret < 0) {
                vpif_dbg(2, debug, "Error setting custom DV timings\n");
                return ret;
        }

        if (!(timings->bt.width && timings->bt.height &&
                                (timings->bt.hbackporch ||
                                 timings->bt.hfrontporch ||
                                 timings->bt.hsync) &&
                                timings->bt.vfrontporch &&
                                (timings->bt.vbackporch ||
                                 timings->bt.vsync))) {
                vpif_dbg(2, debug, "Timings for width, height, "
                                "horizontal back porch, horizontal sync, "
                                "horizontal front porch, vertical back porch, "
                                "vertical sync and vertical back porch "
                                "must be defined\n");
                return -EINVAL;
        }

        *bt = timings->bt;

        /* Configure video port timings */

        std_info->eav2sav = bt->hbackporch + bt->hfrontporch +
                bt->hsync - 8;
        std_info->sav2eav = bt->width;

        std_info->l1 = 1;
        std_info->l3 = bt->vsync + bt->vbackporch + 1;

        if (bt->interlaced) {
                if (bt->il_vbackporch || bt->il_vfrontporch || bt->il_vsync) {
                        std_info->vsize = bt->height * 2 +
                                bt->vfrontporch + bt->vsync + bt->vbackporch +
                                bt->il_vfrontporch + bt->il_vsync +
                                bt->il_vbackporch;
                        std_info->l5 = std_info->vsize/2 -
                                (bt->vfrontporch - 1);
                        std_info->l7 = std_info->vsize/2 + 1;
                        std_info->l9 = std_info->l7 + bt->il_vsync +
                                bt->il_vbackporch + 1;
                        std_info->l11 = std_info->vsize -
                                (bt->il_vfrontporch - 1);
                } else {
                        vpif_dbg(2, debug, "Required timing values for "
                                        "interlaced BT format missing\n");
                        return -EINVAL;
                }
        } else {
                std_info->vsize = bt->height + bt->vfrontporch +
                        bt->vsync + bt->vbackporch;
                std_info->l5 = std_info->vsize - (bt->vfrontporch - 1);
        }
        strncpy(std_info->name, "Custom timings BT656/1120",
                        VPIF_MAX_NAME);
        std_info->width = bt->width;
        std_info->height = bt->height;
        std_info->frm_fmt = bt->interlaced ? 0 : 1;
        std_info->ycmux_mode = 0;
        std_info->capture_format = 0;
        std_info->vbi_supported = 0;
        std_info->hd_sd = 1;
        std_info->stdid = 0;
        std_info->dv_preset = V4L2_DV_INVALID;

        vid_ch->stdid = 0;
        vid_ch->dv_preset = V4L2_DV_INVALID;

        return 0;
}

/**
 * vpif_g_dv_timings() - G_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: digital video timings
 */
static int vpif_g_dv_timings(struct file *file, void *priv,
                struct v4l2_dv_timings *timings)
{
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;
        struct v4l2_bt_timings *bt = &vid_ch->bt_timings;

        timings->bt = *bt;

        return 0;
}

/*
 * vpif_g_chip_ident() - Identify the chip
 * @file: file ptr
 * @priv: file handle
 * @chip: chip identity
 *
 * Returns zero or -EINVAL if read operations fails.
 */
static int vpif_g_chip_ident(struct file *file, void *priv,
                struct v4l2_dbg_chip_ident *chip)
{
        chip->ident = V4L2_IDENT_NONE;
        chip->revision = 0;
        if (chip->match.type != V4L2_CHIP_MATCH_I2C_DRIVER &&
                        chip->match.type != V4L2_CHIP_MATCH_I2C_ADDR) {
                vpif_dbg(2, debug, "match_type is invalid.\n");
                return -EINVAL;
        }

        return v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 0, core,
                        g_chip_ident, chip);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
/*
 * vpif_dbg_g_register() - Read register
 * @file: file ptr
 * @priv: file handle
 * @reg: register to be read
 *
 * Debugging only
 * Returns zero or -EINVAL if read operations fails.
 */
static int vpif_dbg_g_register(struct file *file, void *priv,
                struct v4l2_dbg_register *reg){
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;

        return v4l2_subdev_call(vpif_obj.sd[vid_ch->output_id], core,
                        g_register, reg);
}

/*
 * vpif_dbg_s_register() - Write to register
 * @file: file ptr
 * @priv: file handle
 * @reg: register to be modified
 *
 * Debugging only
 * Returns zero or -EINVAL if write operations fails.
 */
static int vpif_dbg_s_register(struct file *file, void *priv,
                struct v4l2_dbg_register *reg){
        struct vpif_fh *fh = priv;
        struct channel_obj *ch = fh->channel;
        struct video_obj *vid_ch = &ch->video;

        return v4l2_subdev_call(vpif_obj.sd[vid_ch->output_id], core,
                        s_register, reg);
}
#endif

/*
 * vpif_log_status() - Status information
 * @file: file ptr
 * @priv: file handle
 *
 * Returns zero.
 */
static int vpif_log_status(struct file *filep, void *priv)
{
        /* status for sub devices */
        v4l2_device_call_all(&vpif_obj.v4l2_dev, 0, core, log_status);

        return 0;
}

/* vpif display ioctl operations */
static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
        .vidioc_querycap                = vpif_querycap,
        .vidioc_g_priority              = vpif_g_priority,
        .vidioc_s_priority              = vpif_s_priority,
        .vidioc_enum_fmt_vid_out        = vpif_enum_fmt_vid_out,
        .vidioc_g_fmt_vid_out           = vpif_g_fmt_vid_out,
        .vidioc_s_fmt_vid_out           = vpif_s_fmt_vid_out,
        .vidioc_try_fmt_vid_out         = vpif_try_fmt_vid_out,
        .vidioc_reqbufs                 = vpif_reqbufs,
        .vidioc_querybuf                = vpif_querybuf,
        .vidioc_qbuf                    = vpif_qbuf,
        .vidioc_dqbuf                   = vpif_dqbuf,
        .vidioc_streamon                = vpif_streamon,
        .vidioc_streamoff               = vpif_streamoff,
        .vidioc_s_std                   = vpif_s_std,
        .vidioc_g_std                   = vpif_g_std,
        .vidioc_enum_output             = vpif_enum_output,
        .vidioc_s_output                = vpif_s_output,
        .vidioc_g_output                = vpif_g_output,
        .vidioc_cropcap                 = vpif_cropcap,
        .vidioc_enum_dv_presets         = vpif_enum_dv_presets,
        .vidioc_s_dv_preset             = vpif_s_dv_preset,
        .vidioc_g_dv_preset             = vpif_g_dv_preset,
        .vidioc_s_dv_timings            = vpif_s_dv_timings,
        .vidioc_g_dv_timings            = vpif_g_dv_timings,
        .vidioc_g_chip_ident            = vpif_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .vidioc_g_register              = vpif_dbg_g_register,
        .vidioc_s_register              = vpif_dbg_s_register,
#endif
        .vidioc_log_status              = vpif_log_status,
};

static const struct v4l2_file_operations vpif_fops = {
        .owner          = THIS_MODULE,
        .open           = vpif_open,
        .release        = vpif_release,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vpif_mmap,
        .poll           = vpif_poll
};

static struct video_device vpif_video_template = {
        .name           = "vpif",
        .fops           = &vpif_fops,
        .ioctl_ops      = &vpif_ioctl_ops,
        .tvnorms        = DM646X_V4L2_STD,
        .current_norm   = V4L2_STD_625_50,

};

/*Configure the channels, buffer sizei, request irq */
static int initialize_vpif(void)
{
        int free_channel_objects_index;
        int free_buffer_channel_index;
        int free_buffer_index;
        int err = 0, i, j;

        /* Default number of buffers should be 3 */
        if ((ch2_numbuffers > 0) &&
            (ch2_numbuffers < config_params.min_numbuffers))
                ch2_numbuffers = config_params.min_numbuffers;
        if ((ch3_numbuffers > 0) &&
            (ch3_numbuffers < config_params.min_numbuffers))
                ch3_numbuffers = config_params.min_numbuffers;

        /* Set buffer size to min buffers size if invalid buffer size is
         * given */
        if (ch2_bufsize < config_params.min_bufsize[VPIF_CHANNEL2_VIDEO])
                ch2_bufsize =
                    config_params.min_bufsize[VPIF_CHANNEL2_VIDEO];
        if (ch3_bufsize < config_params.min_bufsize[VPIF_CHANNEL3_VIDEO])
                ch3_bufsize =
                    config_params.min_bufsize[VPIF_CHANNEL3_VIDEO];

        config_params.numbuffers[VPIF_CHANNEL2_VIDEO] = ch2_numbuffers;

        if (ch2_numbuffers) {
                config_params.channel_bufsize[VPIF_CHANNEL2_VIDEO] =
                                                        ch2_bufsize;
        }
        config_params.numbuffers[VPIF_CHANNEL3_VIDEO] = ch3_numbuffers;

        if (ch3_numbuffers) {
                config_params.channel_bufsize[VPIF_CHANNEL3_VIDEO] =
                                                        ch3_bufsize;
        }

        /* Allocate memory for six channel objects */
        for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
                vpif_obj.dev[i] =
                    kzalloc(sizeof(struct channel_obj), GFP_KERNEL);
                /* If memory allocation fails, return error */
                if (!vpif_obj.dev[i]) {
                        free_channel_objects_index = i;
                        err = -ENOMEM;
                        goto vpif_init_free_channel_objects;
                }
        }

        free_channel_objects_index = VPIF_DISPLAY_MAX_DEVICES;
        free_buffer_channel_index = VPIF_DISPLAY_NUM_CHANNELS;
        free_buffer_index = config_params.numbuffers[i - 1];

        return 0;

vpif_init_free_channel_objects:
        for (j = 0; j < free_channel_objects_index; j++)
                kfree(vpif_obj.dev[j]);
        return err;
}

/*
 * vpif_probe: This function creates device entries by register itself to the
 * V4L2 driver and initializes fields of each channel objects
 */
static __init int vpif_probe(struct platform_device *pdev)
{
        struct vpif_subdev_info *subdevdata;
        struct vpif_display_config *config;
        int i, j = 0, k, q, m, err = 0;
        struct i2c_adapter *i2c_adap;
        struct common_obj *common;
        struct channel_obj *ch;
        struct video_device *vfd;
        struct resource *res;
        int subdev_count;

        vpif_dev = &pdev->dev;

        err = initialize_vpif();

        if (err) {
                v4l2_err(vpif_dev->driver, "Error initializing vpif\n");
                return err;
        }

        err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
        if (err) {
                v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
                return err;
        }

        k = 0;
        while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, k))) {
                for (i = res->start; i <= res->end; i++) {
                        if (request_irq(i, vpif_channel_isr, IRQF_DISABLED,
                                        "DM646x_Display",
                                (void *)(&vpif_obj.dev[k]->channel_id))) {
                                err = -EBUSY;
                                goto vpif_int_err;
                        }
                }
                k++;
        }

        for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {

                /* Get the pointer to the channel object */
                ch = vpif_obj.dev[i];

                /* Allocate memory for video device */
                vfd = video_device_alloc();
                if (vfd == NULL) {
                        for (j = 0; j < i; j++) {
                                ch = vpif_obj.dev[j];
                                video_device_release(ch->video_dev);
                        }
                        err = -ENOMEM;
                        goto vpif_int_err;
                }

                /* Initialize field of video device */
                *vfd = vpif_video_template;
                vfd->v4l2_dev = &vpif_obj.v4l2_dev;
                vfd->release = video_device_release;
                snprintf(vfd->name, sizeof(vfd->name),
                         "DM646x_VPIFDisplay_DRIVER_V%d.%d.%d",
                         (VPIF_DISPLAY_VERSION_CODE >> 16) & 0xff,
                         (VPIF_DISPLAY_VERSION_CODE >> 8) & 0xff,
                         (VPIF_DISPLAY_VERSION_CODE) & 0xff);

                /* Set video_dev to the video device */
                ch->video_dev = vfd;
        }

        for (j = 0; j < VPIF_DISPLAY_MAX_DEVICES; j++) {
                ch = vpif_obj.dev[j];
                /* Initialize field of the channel objects */
                atomic_set(&ch->usrs, 0);
                for (k = 0; k < VPIF_NUMOBJECTS; k++) {
                        ch->common[k].numbuffers = 0;
                        common = &ch->common[k];
                        common->io_usrs = 0;
                        common->started = 0;
                        spin_lock_init(&common->irqlock);
                        mutex_init(&common->lock);
                        common->numbuffers = 0;
                        common->set_addr = NULL;
                        common->ytop_off = common->ybtm_off = 0;
                        common->ctop_off = common->cbtm_off = 0;
                        common->cur_frm = common->next_frm = NULL;
                        memset(&common->fmt, 0, sizeof(common->fmt));
                        common->numbuffers = config_params.numbuffers[k];

                }
                ch->initialized = 0;
                ch->channel_id = j;
                if (j < 2)
                        ch->common[VPIF_VIDEO_INDEX].numbuffers =
                            config_params.numbuffers[ch->channel_id];
                else
                        ch->common[VPIF_VIDEO_INDEX].numbuffers = 0;

                memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));

                /* Initialize prio member of channel object */
                v4l2_prio_init(&ch->prio);
                ch->common[VPIF_VIDEO_INDEX].fmt.type =
                                                V4L2_BUF_TYPE_VIDEO_OUTPUT;
                ch->video_dev->lock = &common->lock;

                /* register video device */
                vpif_dbg(1, debug, "channel=%x,channel->video_dev=%x\n",
                                (int)ch, (int)&ch->video_dev);

                err = video_register_device(ch->video_dev,
                                          VFL_TYPE_GRABBER, (j ? 3 : 2));
                if (err < 0)
                        goto probe_out;

                video_set_drvdata(ch->video_dev, ch);
        }

        i2c_adap = i2c_get_adapter(1);
        config = pdev->dev.platform_data;
        subdev_count = config->subdev_count;
        subdevdata = config->subdevinfo;
        vpif_obj.sd = kzalloc(sizeof(struct v4l2_subdev *) * subdev_count,
                                                                GFP_KERNEL);
        if (vpif_obj.sd == NULL) {
                vpif_err("unable to allocate memory for subdevice pointers\n");
                err = -ENOMEM;
                goto probe_out;
        }

        for (i = 0; i < subdev_count; i++) {
                vpif_obj.sd[i] = v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
                                                i2c_adap,
                                                &subdevdata[i].board_info,
                                                NULL);
                if (!vpif_obj.sd[i]) {
                        vpif_err("Error registering v4l2 subdevice\n");
                        goto probe_subdev_out;
                }

                if (vpif_obj.sd[i])
                        vpif_obj.sd[i]->grp_id = 1 << i;
        }

        v4l2_info(&vpif_obj.v4l2_dev,
                        "DM646x VPIF display driver initialized\n");
        return 0;

probe_subdev_out:
        kfree(vpif_obj.sd);
probe_out:
        for (k = 0; k < j; k++) {
                ch = vpif_obj.dev[k];
                video_unregister_device(ch->video_dev);
                video_device_release(ch->video_dev);
                ch->video_dev = NULL;
        }
vpif_int_err:
        v4l2_device_unregister(&vpif_obj.v4l2_dev);
        vpif_err("VPIF IRQ request failed\n");
        for (q = k; k >= 0; k--) {
                for (m = i; m >= res->start; m--)
                        free_irq(m, (void *)(&vpif_obj.dev[k]->channel_id));
                res = platform_get_resource(pdev, IORESOURCE_IRQ, k-1);
                m = res->end;
        }

        return err;
}

/*
 * vpif_remove: It un-register channels from V4L2 driver
 */
static int vpif_remove(struct platform_device *device)
{
        struct channel_obj *ch;
        int i;

        v4l2_device_unregister(&vpif_obj.v4l2_dev);

        /* un-register device */
        for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
                /* Get the pointer to the channel object */
                ch = vpif_obj.dev[i];
                /* Unregister video device */
                video_unregister_device(ch->video_dev);

                ch->video_dev = NULL;
        }

        return 0;
}

static __refdata struct platform_driver vpif_driver = {
        .driver = {
                        .name   = "vpif_display",
                        .owner  = THIS_MODULE,
        },
        .probe  = vpif_probe,
        .remove = vpif_remove,
};

static __init int vpif_init(void)
{
        return platform_driver_register(&vpif_driver);
}

/*
 * vpif_cleanup: This function un-registers device and driver to the kernel,
 * frees requested irq handler and de-allocates memory allocated for channel
 * objects.
 */
static void vpif_cleanup(void)
{
        struct platform_device *pdev;
        struct resource *res;
        int irq_num;
        int i = 0;

        pdev = container_of(vpif_dev, struct platform_device, dev);

        while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, i))) {
                for (irq_num = res->start; irq_num <= res->end; irq_num++)
                        free_irq(irq_num,
                                 (void *)(&vpif_obj.dev[i]->channel_id));
                i++;
        }

        platform_driver_unregister(&vpif_driver);
        kfree(vpif_obj.sd);
        for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++)
                kfree(vpif_obj.dev[i]);
}

module_init(vpif_init);
module_exit(vpif_cleanup);