vpif_capture.c

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/*
 * Copyright (C) 2009 Texas Instruments Inc
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * TODO : add support for VBI & HBI data service
 *    add static buffer allocation
 */
#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/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-chip-ident.h>

#include "vpif_capture.h"
#include "vpif.h"

MODULE_DESCRIPTION("TI DaVinci VPIF Capture driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(VPIF_CAPTURE_VERSION);

#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 ch0_numbuffers = 3;
static u32 ch1_numbuffers = 3;
static u32 ch0_bufsize = 1920 * 1080 * 2;
static u32 ch1_bufsize = 720 * 576 * 2;

module_param(debug, int, 0644);
module_param(ch0_numbuffers, uint, S_IRUGO);
module_param(ch1_numbuffers, uint, S_IRUGO);
module_param(ch0_bufsize, uint, S_IRUGO);
module_param(ch1_bufsize, uint, S_IRUGO);

MODULE_PARM_DESC(debug, "Debug level 0-1");
MODULE_PARM_DESC(ch2_numbuffers, "Channel0 buffer count (default:3)");
MODULE_PARM_DESC(ch3_numbuffers, "Channel1 buffer count (default:3)");
MODULE_PARM_DESC(ch2_bufsize, "Channel0 buffer size (default:1920 x 1080 x 2)");
MODULE_PARM_DESC(ch3_bufsize, "Channel1 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,
};

/* global variables */
static struct vpif_device vpif_obj = { {NULL} };
static struct device *vpif_dev;
static void vpif_calculate_offsets(struct channel_obj *ch);
static void vpif_config_addr(struct channel_obj *ch, int muxmode);

static int vpif_buffer_prepare(struct vb2_buffer *vb)
{
    /* Get the file handle object and channel object */
    struct vpif_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
    struct vb2_queue *q = vb->vb2_queue;
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;
    unsigned long addr;

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

    common = &ch->common[VPIF_VIDEO_INDEX];

    if (vb->state != VB2_BUF_STATE_ACTIVE &&
        vb->state != VB2_BUF_STATE_PREPARED) {
        vb2_set_plane_payload(vb, 0, common->fmt.fmt.pix.sizeimage);
        if (vb2_plane_vaddr(vb, 0) &&
        vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
            goto exit;
        addr = vb2_dma_contig_plane_dma_addr(vb, 0);

        if (q->streaming) {
            if (!IS_ALIGNED((addr + common->ytop_off), 8) ||
                !IS_ALIGNED((addr + common->ybtm_off), 8) ||
                !IS_ALIGNED((addr + common->ctop_off), 8) ||
                !IS_ALIGNED((addr + common->cbtm_off), 8))
                goto exit;
        }
    }
    return 0;
exit:
    vpif_dbg(1, debug, "buffer_prepare:offset is not aligned to 8 bytes\n");
    return -EINVAL;
}

static int vpif_buffer_queue_setup(struct vb2_queue *vq,
                const struct v4l2_format *fmt,
                unsigned int *nbuffers, unsigned int *nplanes,
                unsigned int sizes[], void *alloc_ctxs[])
{
    /* Get the file handle object and channel object */
    struct vpif_fh *fh = vb2_get_drv_priv(vq);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;
    unsigned long size;

    common = &ch->common[VPIF_VIDEO_INDEX];

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

    /* If memory type is not mmap, return */
    if (V4L2_MEMORY_MMAP == common->memory) {
        /* Calculate the size of the buffer */
        size = config_params.channel_bufsize[ch->channel_id];
        /*
         * Checking if the buffer size exceeds the available buffer
         * ycmux_mode = 0 means 1 channel mode HD and
         * ycmux_mode = 1 means 2 channels mode SD
         */
        if (ch->vpifparams.std_info.ycmux_mode == 0) {
            if (config_params.video_limit[ch->channel_id])
                while (size * *nbuffers >
                    (config_params.video_limit[0]
                        + config_params.video_limit[1]))
                    (*nbuffers)--;
        } else {
            if (config_params.video_limit[ch->channel_id])
                while (size * *nbuffers >
                config_params.video_limit[ch->channel_id])
                    (*nbuffers)--;
        }

    } else {
        size = common->fmt.fmt.pix.sizeimage;
    }

    if (*nbuffers < config_params.min_numbuffers)
        *nbuffers = config_params.min_numbuffers;

    *nplanes = 1;
    sizes[0] = size;
    alloc_ctxs[0] = common->alloc_ctx;

    return 0;
}

static void vpif_buffer_queue(struct vb2_buffer *vb)
{
    /* Get the file handle object and channel object */
    struct vpif_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
    struct channel_obj *ch = fh->channel;
    struct vpif_cap_buffer *buf = container_of(vb,
                struct vpif_cap_buffer, vb);
    struct common_obj *common;

    common = &ch->common[VPIF_VIDEO_INDEX];

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

    /* add the buffer to the DMA queue */
    list_add_tail(&buf->list, &common->dma_queue);
}

static void vpif_buf_cleanup(struct vb2_buffer *vb)
{
    /* Get the file handle object and channel object */
    struct vpif_fh *fh = vb2_get_drv_priv(vb->vb2_queue);
    struct vpif_cap_buffer *buf = container_of(vb,
                    struct vpif_cap_buffer, vb);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;
    unsigned long flags;

    common = &ch->common[VPIF_VIDEO_INDEX];

    spin_lock_irqsave(&common->irqlock, flags);
    if (vb->state == VB2_BUF_STATE_ACTIVE)
        list_del_init(&buf->list);
    spin_unlock_irqrestore(&common->irqlock, flags);

}

static void vpif_wait_prepare(struct vb2_queue *vq)
{
    struct vpif_fh *fh = vb2_get_drv_priv(vq);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;

    common = &ch->common[VPIF_VIDEO_INDEX];
    mutex_unlock(&common->lock);
}

static void vpif_wait_finish(struct vb2_queue *vq)
{
    struct vpif_fh *fh = vb2_get_drv_priv(vq);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;

    common = &ch->common[VPIF_VIDEO_INDEX];
    mutex_lock(&common->lock);
}

static int vpif_buffer_init(struct vb2_buffer *vb)
{
    struct vpif_cap_buffer *buf = container_of(vb,
                    struct vpif_cap_buffer, vb);

    INIT_LIST_HEAD(&buf->list);

    return 0;
}

static u8 channel_first_int[VPIF_NUMBER_OF_OBJECTS][2] =
    { {1, 1} };

static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
{
    struct vpif_capture_config *vpif_config_data =
                    vpif_dev->platform_data;
    struct vpif_fh *fh = vb2_get_drv_priv(vq);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
    struct vpif_params *vpif = &ch->vpifparams;
    unsigned long addr = 0;
    int ret;

        /* If buffer queue is empty, return error */
    if (list_empty(&common->dma_queue)) {
        vpif_dbg(1, debug, "buffer queue is empty\n");
        return -EIO;
    }

    /* Get the next frame from the buffer queue */
    common->cur_frm = common->next_frm = list_entry(common->dma_queue.next,
                    struct vpif_cap_buffer, list);
    /* Remove buffer from the buffer queue */
    list_del(&common->cur_frm->list);
    /* Mark state of the current frame to active */
    common->cur_frm->vb.state = VB2_BUF_STATE_ACTIVE;
    /* Initialize field_id and started member */
    ch->field_id = 0;
    common->started = 1;
    addr = vb2_dma_contig_plane_dma_addr(&common->cur_frm->vb, 0);

    /* Calculate the offset for Y and C data in the buffer */
    vpif_calculate_offsets(ch);

    if ((vpif->std_info.frm_fmt &&
        ((common->fmt.fmt.pix.field != V4L2_FIELD_NONE) &&
         (common->fmt.fmt.pix.field != V4L2_FIELD_ANY))) ||
        (!vpif->std_info.frm_fmt &&
         (common->fmt.fmt.pix.field == V4L2_FIELD_NONE))) {
        vpif_dbg(1, debug, "conflict in field format and std format\n");
        return -EINVAL;
    }

    /* configure 1 or 2 channel mode */
    if (vpif_config_data->setup_input_channel_mode) {
        ret = vpif_config_data->
            setup_input_channel_mode(vpif->std_info.ycmux_mode);
        if (ret < 0) {
            vpif_dbg(1, debug, "can't set vpif channel mode\n");
            return ret;
        }
    }

    /* Call vpif_set_params function to set the parameters and addresses */
    ret = vpif_set_video_params(vpif, ch->channel_id);

    if (ret < 0) {
        vpif_dbg(1, debug, "can't set video params\n");
        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);

    channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
    if ((VPIF_CHANNEL0_VIDEO == ch->channel_id)) {
        channel0_intr_assert();
        channel0_intr_enable(1);
        enable_channel0(1);
    }
    if ((VPIF_CHANNEL1_VIDEO == ch->channel_id) ||
        (common->started == 2)) {
        channel1_intr_assert();
        channel1_intr_enable(1);
        enable_channel1(1);
    }

    return 0;
}

/* abort streaming and wait for last buffer */
static int vpif_stop_streaming(struct vb2_queue *vq)
{
    struct vpif_fh *fh = vb2_get_drv_priv(vq);
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;

    if (!vb2_is_streaming(vq))
        return 0;

    common = &ch->common[VPIF_VIDEO_INDEX];

    /* release all active buffers */
    while (!list_empty(&common->dma_queue)) {
        common->next_frm = list_entry(common->dma_queue.next,
                        struct vpif_cap_buffer, list);
        list_del(&common->next_frm->list);
        vb2_buffer_done(&common->next_frm->vb, VB2_BUF_STATE_ERROR);
    }

    return 0;
}

static struct vb2_ops video_qops = {
    .queue_setup        = vpif_buffer_queue_setup,
    .wait_prepare       = vpif_wait_prepare,
    .wait_finish        = vpif_wait_finish,
    .buf_init       = vpif_buffer_init,
    .buf_prepare        = vpif_buffer_prepare,
    .start_streaming    = vpif_start_streaming,
    .stop_streaming     = vpif_stop_streaming,
    .buf_cleanup        = vpif_buf_cleanup,
    .buf_queue      = vpif_buffer_queue,
};

static void vpif_process_buffer_complete(struct common_obj *common)
{
    do_gettimeofday(&common->cur_frm->vb.v4l2_buf.timestamp);
    vb2_buffer_done(&common->cur_frm->vb,
                        VB2_BUF_STATE_DONE);
    /* Make curFrm pointing to nextFrm */
    common->cur_frm = common->next_frm;
}

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

    common->next_frm = list_entry(common->dma_queue.next,
                     struct vpif_cap_buffer, list);
    /* Remove that buffer from the buffer queue */
    list_del(&common->next_frm->list);
    common->next_frm->vb.state = VB2_BUF_STATE_ACTIVE;
    addr = vb2_dma_contig_plane_dma_addr(&common->next_frm->vb, 0);

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

static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
{
    struct vpif_device *dev = &vpif_obj;
    struct common_obj *common;
    struct channel_obj *ch;
    enum v4l2_field field;
    int channel_id = 0;
    int fid = -1, i;

    channel_id = *(int *)(dev_id);
    if (!vpif_intr_status(channel_id))
        return IRQ_NONE;

    ch = dev->dev[channel_id];

    field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;

    for (i = 0; i < VPIF_NUMBER_OF_OBJECTS; i++) {
        common = &ch->common[i];
        /* skip If streaming is not started in this channel */
        if (0 == common->started)
            continue;

        /* Check the field format */
        if (1 == ch->vpifparams.std_info.frm_fmt) {
            /* Progressive mode */
            if (list_empty(&common->dma_queue))
                continue;

            if (!channel_first_int[i][channel_id])
                vpif_process_buffer_complete(common);

            channel_first_int[i][channel_id] = 0;

            vpif_schedule_next_buffer(common);


            channel_first_int[i][channel_id] = 0;
        } else {
            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);
                if (fid != ch->field_id) {
                    if (0 == fid)
                        ch->field_id = fid;
                    return IRQ_HANDLED;
                }
            }
            /* device field id and local field id are in sync */
            if (0 == fid) {
                /* this is even field */
                if (common->cur_frm == common->next_frm)
                    continue;

                /* mark the current buffer as done */
                vpif_process_buffer_complete(common);
            } else if (1 == fid) {
                /* odd field */
                if (list_empty(&common->dma_queue) ||
                    (common->cur_frm != common->next_frm))
                    continue;

                vpif_schedule_next_buffer(common);
            }
        }
    }
    return IRQ_HANDLED;
}

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

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

    for (index = 0; index < vpif_ch_params_count; index++) {
        config = &ch_params[index];
        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 (!memcmp(&config->dv_timings, &vid_ch->dv_timings,
                sizeof(vid_ch->dv_timings))) {
                memcpy(std_info, config, sizeof(*config));
                break;
            }
        }
    }

    /* standard not found */
    if (index == vpif_ch_params_count)
        return -EINVAL;

    common->fmt.fmt.pix.width = std_info->width;
    common->width = std_info->width;
    common->fmt.fmt.pix.height = std_info->height;
    common->height = std_info->height;
    common->fmt.fmt.pix.bytesperline = std_info->width;
    vpifparams->video_params.hpitch = std_info->width;
    vpifparams->video_params.storage_mode = std_info->frm_fmt;

    return 0;
}

static void vpif_calculate_offsets(struct channel_obj *ch)
{
    unsigned int hpitch, vpitch, sizeimage;
    struct video_obj *vid_ch = &(ch->video);
    struct vpif_params *vpifparams = &ch->vpifparams;
    struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
    enum v4l2_field field = common->fmt.fmt.pix.field;

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

    if (V4L2_FIELD_ANY == field) {
        if (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;

    sizeimage = common->fmt.fmt.pix.sizeimage;

    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)) {
        /* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
        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) {
        /* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
        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) {
        /* Calculate offsets for Y top, Y Bottom, C top and C Bottom */
        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 (1 == vpifparams->std_info.frm_fmt)
        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 = vpifparams->std_info.stdid;
}

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

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

    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];

    if (ch->vpifparams.iface.if_type == VPIF_IF_RAW_BAYER)
        common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_SBGGR8;
    else
        common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
    common->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
}

static inline enum v4l2_field vpif_get_default_field(
                struct vpif_interface *iface)
{
    return (iface->if_type == VPIF_IF_RAW_BAYER) ? V4L2_FIELD_NONE :
                        V4L2_FIELD_INTERLACED;
}

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

    vpif_dbg(2, debug, "vpif_check_format\n");
    if (vpif_params->iface.if_type == VPIF_IF_RAW_BAYER) {
        if (pixfmt->pixelformat != V4L2_PIX_FMT_SBGGR8) {
            if (!update) {
                vpif_dbg(2, debug, "invalid pix format\n");
                goto exit;
            }
            pixfmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
        }
    } else {
        if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P) {
            if (!update) {
                vpif_dbg(2, debug, "invalid pixel format\n");
                goto exit;
            }
            pixfmt->pixelformat = V4L2_PIX_FMT_YUV422P;
        }
    }

    if (!(VPIF_VALID_FIELD(field))) {
        if (!update) {
            vpif_dbg(2, debug, "invalid field format\n");
            goto exit;
        }
        field = vpif_get_default_field(&vpif_params->iface);
    } else if (field == V4L2_FIELD_ANY)
        /* unsupported field. Use default */
        field = vpif_get_default_field(&vpif_params->iface);

    /* validate the hpitch */
    hpitch = pixfmt->bytesperline;
    if (hpitch < vpif_params->std_info.width) {
        if (!update) {
            vpif_dbg(2, debug, "invalid hpitch\n");
            goto exit;
        }
        hpitch = vpif_params->std_info.width;
    }

    sizeimage = pixfmt->sizeimage;

    vpitch = sizeimage / (hpitch * 2);

    /* validate the vpitch */
    if (vpitch < vpif_params->std_info.height) {
        if (!update) {
            vpif_dbg(2, debug, "Invalid vpitch\n");
            goto exit;
        }
        vpitch = vpif_params->std_info.height;
    }

    /* Check for 8 byte alignment */
    if (!ALIGN(hpitch, 8)) {
        if (!update) {
            vpif_dbg(2, debug, "invalid pitch alignment\n");
            goto exit;
        }
        /* adjust to next 8 byte boundary */
        hpitch = (((hpitch + 7) / 8) * 8);
    }
    /* if update is set, modify the bytesperline and sizeimage */
    if (update) {
        pixfmt->bytesperline = hpitch;
        pixfmt->sizeimage = hpitch * vpitch * 2;
    }
    pixfmt->width = common->fmt.fmt.pix.width;
    pixfmt->height = common->fmt.fmt.pix.height;
    return 0;
exit:
    return ret;
}

static void vpif_config_addr(struct channel_obj *ch, int muxmode)
{
    struct common_obj *common;

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

    common = &(ch->common[VPIF_VIDEO_INDEX]);

    if (VPIF_CHANNEL1_VIDEO == ch->channel_id)
        common->set_addr = ch1_set_videobuf_addr;
    else if (2 == muxmode)
        common->set_addr = ch0_set_videobuf_addr_yc_nmux;
    else
        common->set_addr = ch0_set_videobuf_addr;
}

static int vpif_mmap(struct file *filep, struct vm_area_struct *vma)
{
    /* Get the channel object and file handle object */
    struct vpif_fh *fh = filep->private_data;
    struct channel_obj *ch = fh->channel;
    struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]);
    int ret;

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

    if (mutex_lock_interruptible(&common->lock))
        return -ERESTARTSYS;
    ret = vb2_mmap(&common->buffer_queue, vma);
    mutex_unlock(&common->lock);
    return ret;
}

static unsigned int vpif_poll(struct file *filep, poll_table * wait)
{
    struct vpif_fh *fh = filep->private_data;
    struct channel_obj *channel = fh->channel;
    struct common_obj *common = &(channel->common[VPIF_VIDEO_INDEX]);
    unsigned int res = 0;

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

    if (common->started) {
        mutex_lock(&common->lock);
        res = vb2_poll(&common->buffer_queue, filep, wait);
        mutex_unlock(&common->lock);
    }
    return res;
}

static int vpif_open(struct file *filep)
{
    struct video_device *vdev = video_devdata(filep);
    struct common_obj *common;
    struct video_obj *vid_ch;
    struct channel_obj *ch;
    struct vpif_fh *fh;

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

    ch = video_get_drvdata(vdev);

    vid_ch = &ch->video;
    common = &ch->common[VPIF_VIDEO_INDEX];

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

    if (mutex_lock_interruptible(&common->lock)) {
        kfree(fh);
        return -ERESTARTSYS;
    }
    /* store pointer to fh in private_data member of filep */
    filep->private_data = fh;
    fh->channel = ch;
    fh->initialized = 0;
    /* If decoder is not initialized. initialize it */
    if (!ch->initialized) {
        fh->initialized = 1;
        ch->initialized = 1;
        memset(&(ch->vpifparams), 0, sizeof(struct vpif_params));
    }
    /* Increment channel usrs counter */
    ch->usrs++;
    /* Set io_allowed 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);
    mutex_unlock(&common->lock);
    return 0;
}

static int vpif_release(struct file *filep)
{
    struct vpif_fh *fh = filep->private_data;
    struct channel_obj *ch = fh->channel;
    struct common_obj *common;

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

    common = &ch->common[VPIF_VIDEO_INDEX];

    mutex_lock(&common->lock);
    /* 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 as per its device type and channel id */
        if (VPIF_CHANNEL0_VIDEO == ch->channel_id) {
            enable_channel0(0);
            channel0_intr_enable(0);
        }
        if ((VPIF_CHANNEL1_VIDEO == ch->channel_id) ||
            (2 == common->started)) {
            enable_channel1(0);
            channel1_intr_enable(0);
        }
        common->started = 0;
        /* Free buffers allocated */
        vb2_queue_release(&common->buffer_queue);
        vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
    }

    /* Decrement channel usrs counter */
    ch->usrs--;

    /* Close the priority */
    v4l2_prio_close(&ch->prio, fh->prio);

    if (fh->initialized)
        ch->initialized = 0;

    mutex_unlock(&common->lock);
    filep->private_data = NULL;
    kfree(fh);
    return 0;
}

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;
    u8 index = 0;
    struct vb2_queue *q;
    int ret;

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

    if ((VPIF_CHANNEL0_VIDEO == ch->channel_id)
        || (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
        if (!fh->initialized) {
            vpif_dbg(1, debug, "Channel Busy\n");
            return -EBUSY;
        }
    }

    if (V4L2_BUF_TYPE_VIDEO_CAPTURE != reqbuf->type || !vpif_dev)
        return -EINVAL;

    index = VPIF_VIDEO_INDEX;

    common = &ch->common[index];

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

    /* Initialize videobuf2 queue as per the buffer type */
    common->alloc_ctx = vb2_dma_contig_init_ctx(vpif_dev);
    if (!common->alloc_ctx) {
        vpif_err("Failed to get the context\n");
        return -EINVAL;
    }
    q = &common->buffer_queue;
    q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    q->io_modes = VB2_MMAP | VB2_USERPTR;
    q->drv_priv = fh;
    q->ops = &video_qops;
    q->mem_ops = &vb2_dma_contig_memops;
    q->buf_struct_size = sizeof(struct vpif_cap_buffer);

    ret = vb2_queue_init(q);
    if (ret) {
        vpif_err("vpif_capture: vb2_queue_init() failed\n");
        vb2_dma_contig_cleanup_ctx(common->alloc_ctx);
        return ret;
    }
    /* 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 vb2_reqbufs(&common->buffer_queue, reqbuf);
}

static int vpif_querybuf(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];

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

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

    if (common->memory != V4L2_MEMORY_MMAP) {
        vpif_dbg(1, debug, "Invalid memory\n");
        return -EINVAL;
    }

    return vb2_querybuf(&common->buffer_queue, buf);
}

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;

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

    if (common->fmt.type != tbuf.type) {
        vpif_err("invalid buffer type\n");
        return -EINVAL;
    }

    if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
        vpif_err("fh io not allowed\n");
        return -EACCES;
    }

    return vb2_qbuf(&common->buffer_queue, buf);
}

static int vpif_dqbuf(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];

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

    return vb2_dqbuf(&common->buffer_queue, buf,
             (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;
    int ret = 0;

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

    vpif = &ch->vpifparams;

    if (buftype != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
        vpif_dbg(1, debug, "buffer type not supported\n");
        return -EINVAL;
    }

    /* If file handle is not allowed IO, return error */
    if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
        vpif_dbg(1, debug, "io not allowed\n");
        return -EACCES;
    }

    /* If Streaming is already started, return error */
    if (common->started) {
        vpif_dbg(1, debug, "channel->started\n");
        return -EBUSY;
    }

    if ((ch->channel_id == VPIF_CHANNEL0_VIDEO &&
        oth_ch->common[VPIF_VIDEO_INDEX].started &&
        vpif->std_info.ycmux_mode == 0) ||
       ((ch->channel_id == VPIF_CHANNEL1_VIDEO) &&
        (2 == oth_ch->common[VPIF_VIDEO_INDEX].started))) {
        vpif_dbg(1, debug, "other channel is being used\n");
        return -EBUSY;
    }

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

    /* Enable streamon on the sub device */
    ret = v4l2_subdev_call(ch->sd, video, s_stream, 1);

    if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV) {
        vpif_dbg(1, debug, "stream on failed in subdev\n");
        return ret;
    }

    /* Call vb2_streamon to start streaming in videobuf2 */
    ret = vb2_streamon(&common->buffer_queue, buftype);
    if (ret) {
        vpif_dbg(1, debug, "vb2_streamon\n");
        return ret;
    }

    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];
    int ret;

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

    if (buftype != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
        vpif_dbg(1, debug, "buffer type not supported\n");
        return -EINVAL;
    }

    /* If io is allowed for this file handle, return error */
    if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
        vpif_dbg(1, debug, "io not allowed\n");
        return -EACCES;
    }

    /* If streaming is not started, return error */
    if (!common->started) {
        vpif_dbg(1, debug, "channel->started\n");
        return -EINVAL;
    }

    /* disable channel */
    if (VPIF_CHANNEL0_VIDEO == ch->channel_id) {
        enable_channel0(0);
        channel0_intr_enable(0);
    } else {
        enable_channel1(0);
        channel1_intr_enable(0);
    }

    common->started = 0;

    ret = v4l2_subdev_call(ch->sd, video, s_stream, 0);

    if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
        vpif_dbg(1, debug, "stream off failed in subdev\n");

    return vb2_streamoff(&common->buffer_queue, buftype);
}

static int vpif_input_to_subdev(
        struct vpif_capture_config *vpif_cfg,
        struct vpif_capture_chan_config *chan_cfg,
        int input_index)
{
    struct vpif_subdev_info *subdev_info;
    const char *subdev_name;
    int i;

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

    subdev_name = chan_cfg->inputs[input_index].subdev_name;
    if (subdev_name == NULL)
        return -1;

    /* loop through the sub device list to get the sub device info */
    for (i = 0; i < vpif_cfg->subdev_count; i++) {
        subdev_info = &vpif_cfg->subdev_info[i];
        if (!strcmp(subdev_info->name, subdev_name))
            return i;
    }
    return -1;
}

static int vpif_set_input(
        struct vpif_capture_config *vpif_cfg,
        struct channel_obj *ch,
        int index)
{
    struct vpif_capture_chan_config *chan_cfg =
            &vpif_cfg->chan_config[ch->channel_id];
    struct vpif_subdev_info *subdev_info = NULL;
    struct v4l2_subdev *sd = NULL;
    u32 input = 0, output = 0;
    int sd_index;
    int ret;

    sd_index = vpif_input_to_subdev(vpif_cfg, chan_cfg, index);
    if (sd_index >= 0) {
        sd = vpif_obj.sd[sd_index];
        subdev_info = &vpif_cfg->subdev_info[sd_index];
    }

    /* first setup input path from sub device to vpif */
    if (sd && vpif_cfg->setup_input_path) {
        ret = vpif_cfg->setup_input_path(ch->channel_id,
                       subdev_info->name);
        if (ret < 0) {
            vpif_dbg(1, debug, "couldn't setup input path for the" \
            " sub device %s, for input index %d\n",
            subdev_info->name, index);
            return ret;
        }
    }

    if (sd) {
        input = chan_cfg->inputs[index].input_route;
        output = chan_cfg->inputs[index].output_route;
        ret = v4l2_subdev_call(sd, video, s_routing,
                input, output, 0);
        if (ret < 0 && ret != -ENOIOCTLCMD) {
            vpif_dbg(1, debug, "Failed to set input\n");
            return ret;
        }
    }
    ch->input_idx = index;
    ch->sd = sd;
    /* copy interface parameters to vpif */
    ch->vpifparams.iface = chan_cfg->vpif_if;

    /* update tvnorms from the sub device input info */
    ch->video_dev->tvnorms = chan_cfg->inputs[index].input.std;
    return 0;
}

static int vpif_querystd(struct file *file, void *priv, v4l2_std_id *std_id)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;
    int ret = 0;

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

    /* Call querystd function of decoder device */
    ret = v4l2_subdev_call(ch->sd, video, querystd, std_id);

    if (ret == -ENOIOCTLCMD || ret == -ENODEV)
        return -ENODATA;
    if (ret) {
        vpif_dbg(1, debug, "Failed to query standard for sub devices\n");
        return ret;
    }

    return 0;
}

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;

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

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

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;

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

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

    if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
        (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
        if (!fh->initialized) {
            vpif_dbg(1, debug, "Channel Busy\n");
            return -EBUSY;
        }
    }

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

    fh->initialized = 1;

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

    /* Get the information about the standard */
    if (vpif_update_std_info(ch)) {
        vpif_err("Error getting the standard info\n");
        return -EINVAL;
    }

    /* Configure the default format information */
    vpif_config_format(ch);

    /* set standard in the sub device */
    ret = v4l2_subdev_call(ch->sd, core, s_std, *std_id);
    if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV) {
        vpif_dbg(1, debug, "Failed to set standard for sub devices\n");
        return ret;
    }
    return 0;
}

static int vpif_enum_input(struct file *file, void *priv,
                struct v4l2_input *input)
{

    struct vpif_capture_config *config = vpif_dev->platform_data;
    struct vpif_capture_chan_config *chan_cfg;
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;

    chan_cfg = &config->chan_config[ch->channel_id];

    if (input->index >= chan_cfg->input_count) {
        vpif_dbg(1, debug, "Invalid input index\n");
        return -EINVAL;
    }

    memcpy(input, &chan_cfg->inputs[input->index].input,
        sizeof(*input));
    return 0;
}

static int vpif_g_input(struct file *file, void *priv, unsigned int *index)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;

    *index = ch->input_idx;
    return 0;
}

static int vpif_s_input(struct file *file, void *priv, unsigned int index)
{
    struct vpif_capture_config *config = vpif_dev->platform_data;
    struct vpif_capture_chan_config *chan_cfg;
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;
    struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
    int ret;

    chan_cfg = &config->chan_config[ch->channel_id];

    if (index >= chan_cfg->input_count)
        return -EINVAL;

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

    if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
        (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
        if (!fh->initialized) {
            vpif_dbg(1, debug, "Channel Busy\n");
            return -EBUSY;
        }
    }

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

    fh->initialized = 1;
    return vpif_set_input(config, ch, index);
}

static int vpif_enum_fmt_vid_cap(struct file *file, void  *priv,
                    struct v4l2_fmtdesc *fmt)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;

    if (fmt->index != 0) {
        vpif_dbg(1, debug, "Invalid format index\n");
        return -EINVAL;
    }

    /* Fill in the information about format */
    if (ch->vpifparams.iface.if_type == VPIF_IF_RAW_BAYER) {
        fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        strcpy(fmt->description, "Raw Mode -Bayer Pattern GrRBGb");
        fmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
    } else {
        fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
        fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
    }
    return 0;
}

static int vpif_try_fmt_vid_cap(struct file *file, void *priv,
                struct v4l2_format *fmt)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;
    struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;

    return vpif_check_format(ch, pixfmt, 1);
}


static int vpif_g_fmt_vid_cap(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;

    /* Fill in the information about format */
    *fmt = common->fmt;
    return 0;
}

static int vpif_s_fmt_vid_cap(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;
    int ret = 0;

    vpif_dbg(2, debug, "%s\n", __func__);

    /* If streaming is started, return error */
    if (common->started) {
        vpif_dbg(1, debug, "Streaming is started\n");
        return -EBUSY;
    }

    if ((VPIF_CHANNEL0_VIDEO == ch->channel_id) ||
        (VPIF_CHANNEL1_VIDEO == ch->channel_id)) {
        if (!fh->initialized) {
            vpif_dbg(1, debug, "Channel Busy\n");
            return -EBUSY;
        }
    }

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

    fh->initialized = 1;

    pixfmt = &fmt->fmt.pix;
    /* Check for valid field format */
    ret = vpif_check_format(ch, pixfmt, 0);

    if (ret)
        return ret;
    /* store the format in the channel object */
    common->fmt = *fmt;
    return 0;
}

static int vpif_querycap(struct file *file, void  *priv,
                struct v4l2_capability *cap)
{
    struct vpif_capture_config *config = vpif_dev->platform_data;

    cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
    cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
    snprintf(cap->driver, sizeof(cap->driver), "%s", dev_name(vpif_dev));
    snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
         dev_name(vpif_dev));
    strlcpy(cap->card, config->card_name, sizeof(cap->card));

    return 0;
}

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

    *prio = 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);
}

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_CAPTURE != crop->type)
        return -EINVAL;

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

static int
vpif_enum_dv_timings(struct file *file, void *priv,
             struct v4l2_enum_dv_timings *timings)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;
    int ret;

    ret = v4l2_subdev_call(ch->sd, video, enum_dv_timings, timings);
    if (ret == -ENOIOCTLCMD && ret == -ENODEV)
        return -EINVAL;
    return ret;
}

static int
vpif_query_dv_timings(struct file *file, void *priv,
              struct v4l2_dv_timings *timings)
{
    struct vpif_fh *fh = priv;
    struct channel_obj *ch = fh->channel;
    int ret;

    ret = v4l2_subdev_call(ch->sd, video, query_dv_timings, timings);
    if (ret == -ENOIOCTLCMD && ret == -ENODEV)
        return -ENODATA;
    return ret;
}

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->dv_timings.bt;
    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(ch->sd, video, s_dv_timings, timings);
    if (ret == -ENOIOCTLCMD || ret == -ENODEV)
        ret = 0;
    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;
    }

    vid_ch->dv_timings = *timings;

    /* 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;

    vid_ch->stdid = 0;
    return 0;
}

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;

    *timings = vid_ch->dv_timings;

    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;

    return v4l2_subdev_call(ch->sd, 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;

    return v4l2_subdev_call(ch->sd, 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 capture 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_cap    = vpif_enum_fmt_vid_cap,
    .vidioc_g_fmt_vid_cap       = vpif_g_fmt_vid_cap,
    .vidioc_s_fmt_vid_cap       = vpif_s_fmt_vid_cap,
    .vidioc_try_fmt_vid_cap     = vpif_try_fmt_vid_cap,
    .vidioc_enum_input      = vpif_enum_input,
    .vidioc_s_input         = vpif_s_input,
    .vidioc_g_input         = vpif_g_input,
    .vidioc_reqbufs             = vpif_reqbufs,
    .vidioc_querybuf            = vpif_querybuf,
    .vidioc_querystd        = vpif_querystd,
    .vidioc_s_std               = vpif_s_std,
    .vidioc_g_std           = vpif_g_std,
    .vidioc_qbuf                = vpif_qbuf,
    .vidioc_dqbuf               = vpif_dqbuf,
    .vidioc_streamon            = vpif_streamon,
    .vidioc_streamoff           = vpif_streamoff,
    .vidioc_cropcap             = vpif_cropcap,
    .vidioc_enum_dv_timings         = vpif_enum_dv_timings,
    .vidioc_query_dv_timings        = vpif_query_dv_timings,
    .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,
};

/* vpif file operations */
static 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
};

/* vpif video template */
static struct video_device vpif_video_template = {
    .name       = "vpif",
    .fops       = &vpif_fops,
    .minor      = -1,
    .ioctl_ops  = &vpif_ioctl_ops,
};

static int initialize_vpif(void)
{
    int err = 0, i, j;
    int free_channel_objects_index;

    /* Default number of buffers should be 3 */
    if ((ch0_numbuffers > 0) &&
        (ch0_numbuffers < config_params.min_numbuffers))
        ch0_numbuffers = config_params.min_numbuffers;
    if ((ch1_numbuffers > 0) &&
        (ch1_numbuffers < config_params.min_numbuffers))
        ch1_numbuffers = config_params.min_numbuffers;

    /* Set buffer size to min buffers size if it is invalid */
    if (ch0_bufsize < config_params.min_bufsize[VPIF_CHANNEL0_VIDEO])
        ch0_bufsize =
            config_params.min_bufsize[VPIF_CHANNEL0_VIDEO];
    if (ch1_bufsize < config_params.min_bufsize[VPIF_CHANNEL1_VIDEO])
        ch1_bufsize =
            config_params.min_bufsize[VPIF_CHANNEL1_VIDEO];

    config_params.numbuffers[VPIF_CHANNEL0_VIDEO] = ch0_numbuffers;
    config_params.numbuffers[VPIF_CHANNEL1_VIDEO] = ch1_numbuffers;
    if (ch0_numbuffers) {
        config_params.channel_bufsize[VPIF_CHANNEL0_VIDEO]
            = ch0_bufsize;
    }
    if (ch1_numbuffers) {
        config_params.channel_bufsize[VPIF_CHANNEL1_VIDEO]
            = ch1_bufsize;
    }

    /* Allocate memory for six channel objects */
    for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
        vpif_obj.dev[i] =
            kzalloc(sizeof(*vpif_obj.dev[i]), 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;
        }
    }
    return 0;

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

static __init int vpif_probe(struct platform_device *pdev)
{
    struct vpif_subdev_info *subdevdata;
    struct vpif_capture_config *config;
    int i, j, k, err;
    int res_idx = 0;
    struct i2c_adapter *i2c_adap;
    struct channel_obj *ch;
    struct common_obj *common;
    struct video_device *vfd;
    struct resource *res;
    int subdev_count;
    size_t size;

    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;
    }

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

    for (i = 0; i < VPIF_CAPTURE_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 (NULL == vfd) {
            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),
             "VPIF_Capture_DRIVER_V%s",
             VPIF_CAPTURE_VERSION);
        /* Set video_dev to the video device */
        ch->video_dev = vfd;
    }

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (res) {
        size = resource_size(res);
        /* The resources are divided into two equal memory and when we
         * have HD output we can add them together
         */
        for (j = 0; j < VPIF_CAPTURE_MAX_DEVICES; j++) {
            ch = vpif_obj.dev[j];
            ch->channel_id = j;
            /* only enabled if second resource exists */
            config_params.video_limit[ch->channel_id] = 0;
            if (size)
                config_params.video_limit[ch->channel_id] =
                                    size/2;
        }
    }

    i2c_adap = i2c_get_adapter(1);
    config = pdev->dev.platform_data;

    subdev_count = config->subdev_count;
    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 vpif_sd_error;
    }

    for (i = 0; i < subdev_count; i++) {
        subdevdata = &config->subdev_info[i];
        vpif_obj.sd[i] =
            v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
                          i2c_adap,
                          &subdevdata->board_info,
                          NULL);

        if (!vpif_obj.sd[i]) {
            vpif_err("Error registering v4l2 subdevice\n");
            goto probe_subdev_out;
        }
        v4l2_info(&vpif_obj.v4l2_dev, "registered sub device %s\n",
              subdevdata->name);
    }

    for (j = 0; j < VPIF_CAPTURE_MAX_DEVICES; j++) {
        ch = vpif_obj.dev[j];
        ch->channel_id = j;
        common = &(ch->common[VPIF_VIDEO_INDEX]);
        spin_lock_init(&common->irqlock);
        mutex_init(&common->lock);
        ch->video_dev->lock = &common->lock;
        /* Initialize prio member of channel object */
        v4l2_prio_init(&ch->prio);
        video_set_drvdata(ch->video_dev, ch);

        /* select input 0 */
        err = vpif_set_input(config, ch, 0);
        if (err)
            goto probe_out;

        err = video_register_device(ch->video_dev,
                        VFL_TYPE_GRABBER, (j ? 1 : 0));
        if (err)
            goto probe_out;
    }
    v4l2_info(&vpif_obj.v4l2_dev, "VPIF capture driver initialized\n");
    return 0;

probe_out:
    for (k = 0; k < j; k++) {
        /* Get the pointer to the channel object */
        ch = vpif_obj.dev[k];
        /* Unregister video device */
        video_unregister_device(ch->video_dev);
    }
probe_subdev_out:
    /* free sub devices memory */
    kfree(vpif_obj.sd);

vpif_sd_error:
    for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
        ch = vpif_obj.dev[i];
        /* Note: does nothing if ch->video_dev == NULL */
        video_device_release(ch->video_dev);
    }
vpif_int_err:
    v4l2_device_unregister(&vpif_obj.v4l2_dev);
    for (i = 0; i < res_idx; i++) {
        res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
        for (j = res->start; j <= res->end; j++)
            free_irq(j, (void *)(&vpif_obj.dev[i]->channel_id));
    }
    return err;
}

static int vpif_remove(struct platform_device *device)
{
    int i;
    struct channel_obj *ch;

    v4l2_device_unregister(&vpif_obj.v4l2_dev);

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

#ifdef CONFIG_PM

static int vpif_suspend(struct device *dev)
{

    struct common_obj *common;
    struct channel_obj *ch;
    int i;

    for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
        /* Get the pointer to the channel object */
        ch = vpif_obj.dev[i];
        common = &ch->common[VPIF_VIDEO_INDEX];
        mutex_lock(&common->lock);
        if (ch->usrs && common->io_usrs) {
            /* Disable channel */
            if (ch->channel_id == VPIF_CHANNEL0_VIDEO) {
                enable_channel0(0);
                channel0_intr_enable(0);
            }
            if (ch->channel_id == VPIF_CHANNEL1_VIDEO ||
                common->started == 2) {
                enable_channel1(0);
                channel1_intr_enable(0);
            }
        }
        mutex_unlock(&common->lock);
    }

    return 0;
}

/*
 * vpif_resume: vpif device suspend
 */
static int vpif_resume(struct device *dev)
{
    struct common_obj *common;
    struct channel_obj *ch;
    int i;

    for (i = 0; i < VPIF_CAPTURE_MAX_DEVICES; i++) {
        /* Get the pointer to the channel object */
        ch = vpif_obj.dev[i];
        common = &ch->common[VPIF_VIDEO_INDEX];
        mutex_lock(&common->lock);
        if (ch->usrs && common->io_usrs) {
            /* Disable channel */
            if (ch->channel_id == VPIF_CHANNEL0_VIDEO) {
                enable_channel0(1);
                channel0_intr_enable(1);
            }
            if (ch->channel_id == VPIF_CHANNEL1_VIDEO ||
                common->started == 2) {
                enable_channel1(1);
                channel1_intr_enable(1);
            }
        }
        mutex_unlock(&common->lock);
    }

    return 0;
}

static const struct dev_pm_ops vpif_dev_pm_ops = {
    .suspend = vpif_suspend,
    .resume = vpif_resume,
};

#define vpif_pm_ops (&vpif_dev_pm_ops)
#else
#define vpif_pm_ops NULL
#endif

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

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

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_CAPTURE_MAX_DEVICES; i++)
        kfree(vpif_obj.dev[i]);
}

/* Function for module initialization and cleanup */
module_init(vpif_init);
module_exit(vpif_cleanup);