[deliverable/linux.git] / drivers / media / platform / davinci / vpif_capture.c

/*
 * 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);

/**
 * buffer_prepare :  callback function for buffer prepare
 * @vb: ptr to vb2_buffer
 *
 * This is the callback function for buffer prepare when vb2_qbuf()
 * function is called. The buffer is prepared and user space virtual address
 * or user address is converted into  physical address
 */
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;
}

/**
 * vpif_buffer_queue_setup : Callback function for buffer setup.
 * @vq: vb2_queue ptr
 * @fmt: v4l2 format
 * @nbuffers: ptr to number of buffers requested by application
 * @nplanes:: contains number of distinct video planes needed to hold a frame
 * @sizes[]: contains the size (in bytes) of each plane.
 * @alloc_ctxs: ptr to allocation context
 *
 * This callback function is called when reqbuf() is called to adjust
 * the buffer count and buffer size
 */
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;
}

/**
 * vpif_buffer_queue : Callback function to add buffer to DMA queue
 * @vb: ptr to vb2_buffer
 */
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);
}

/**
 * vpif_buf_cleanup : Callback function to free buffer
 * @vb: ptr to vb2_buffer
 *
 * This function is called from the videobuf2 layer to free memory
 * allocated to  the buffers
 */
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);

        /**
         * Set interrupt for both the fields in VPIF Register enable channel in
         * VPIF register
         */
        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,
};

/**
 * vpif_process_buffer_complete: process a completed buffer
 * @common: ptr to common channel object
 *
 * This function time stamp the buffer and mark it as DONE. It also
 * wake up any process waiting on the QUEUE and set the next buffer
 * as current
 */
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;
}

/**
 * vpif_schedule_next_buffer: set next buffer address for capture
 * @common : ptr to common channel object
 *
 * This function will get next buffer from the dma queue and
 * set the buffer address in the vpif register for capture.
 * the buffer is marked active
 */
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);
}

/**
 * vpif_channel_isr : ISR handler for vpif capture
 * @irq: irq number
 * @dev_id: dev_id ptr
 *
 * It changes status of the captured 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 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 {
                        /**
                         * 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);
                                if (fid != ch->field_id) {
                                        /**
                                         * If field id does not match stored
                                         * field id, make them in sync
                                         */
                                        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;
}

/**
 * vpif_update_std_info() - update standard related info
 * @ch: ptr to channel object
 *
 * For a given standard selected by application, update values
 * in the device data structures
 */
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;
}

/**
 * vpif_calculate_offsets : This function calculates buffers offsets
 * @ch : ptr to channel object
 *
 * This function calculates buffer offsets for Y and C in the top and
 * bottom field
 */
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;
}

/**
 * vpif_config_format: configure default frame format in the device
 * ch : ptr to channel object
 */
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;
}

/**
 * vpif_get_default_field() - Get default field type based on interface
 * @vpif_params - ptr to vpif params
 */
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;
}

/**
 * vpif_check_format()  - check given pixel format for compatibility
 * @ch - channel  ptr
 * @pixfmt - Given pixel format
 * @update - update the values as per hardware requirement
 *
 * Check the application pixel format for S_FMT and update the input
 * values as per hardware limits for TRY_FMT. The default pixel and
 * field format is selected based on interface type.
 */
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");
        /**
         * first check for the pixel format. If if_type is Raw bayer,
         * only V4L2_PIX_FMT_SBGGR8 format is supported. Otherwise only
         * V4L2_PIX_FMT_YUV422P is supported
         */
        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;
                }
                /**
                 * By default use FIELD_NONE for RAW Bayer capture
                 * and FIELD_INTERLACED for other interfaces
                 */
                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;
        }
        /**
         * Image width and height is always based on current standard width and
         * height
         */
        pixfmt->width = common->fmt.fmt.pix.width;
        pixfmt->height = common->fmt.fmt.pix.height;
        return 0;
exit:
        return ret;
}

/**
 * vpif_config_addr() - function to configure buffer address in vpif
 * @ch - channel ptr
 * @muxmode - channel mux mode
 */
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;
}

/**
 * vpif_mmap : It is used to map kernel space buffers into user spaces
 * @filep: file pointer
 * @vma: ptr to vm_area_struct
 */
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;
}

/**
 * vpif_poll: It is used for select/poll system call
 * @filep: file pointer
 * @wait: poll table to wait
 */
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;
}

/**
 * vpif_open : vpif open handler
 * @filep: file ptr
 *
 * 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 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;
}

/**
 * vpif_release : function to clean up file close
 * @filep: file pointer
 *
 * 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;

        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;
}

/**
 * vpif_reqbufs() - request buffer handler
 * @file: file ptr
 * @priv: file handle
 * @reqbuf: request buffer structure ptr
 */
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");

        /**
         * This file handle has not initialized the channel,
         * It is not allowed to do settings
         */
        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);
}

/**
 * vpif_querybuf() - query buffer handler
 * @file: file ptr
 * @priv: file handle
 * @buf: v4l2 buffer structure ptr
 */
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);
}

/**
 * vpif_qbuf() - query buffer handler
 * @file: file ptr
 * @priv: file handle
 * @buf: v4l2 buffer structure ptr
 */
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);
}

/**
 * vpif_dqbuf() - query buffer handler
 * @file: file ptr
 * @priv: file handle
 * @buf: v4l2 buffer structure ptr
 */
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));
}

/**
 * vpif_streamon() - streamon handler
 * @file: file ptr
 * @priv: file handle
 * @buftype: v4l2 buffer type
 */
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;
}

/**
 * vpif_streamoff() - streamoff handler
 * @file: file ptr
 * @priv: file handle
 * @buftype: v4l2 buffer type
 */
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);
}

/**
 * vpif_input_to_subdev() - Maps input to sub device
 * @vpif_cfg - global config ptr
 * @chan_cfg - channel config ptr
 * @input_index - Given input index from application
 *
 * lookup the sub device information for a given input index.
 * we report all the inputs to application. inputs table also
 * has sub device name for the each input
 */
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;
}

/**
 * vpif_set_input() - Select an input
 * @vpif_cfg - global config ptr
 * @ch - channel
 * @_index - Given input index from application
 *
 * Select the given input.
 */
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;
}

/**
 * vpif_querystd() - querystd handler
 * @file: file ptr
 * @priv: file handle
 * @std_id: ptr to std id
 *
 * This function is called to detect standard at the selected input
 */
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;
}

/**
 * vpif_g_std() - get STD handler
 * @file: file ptr
 * @priv: file handle
 * @std_id: ptr to std id
 */
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;
}

/**
 * vpif_s_std() - set STD handler
 * @file: file ptr
 * @priv: file handle
 * @std_id: ptr to std id
 */
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;
}

/**
 * vpif_enum_input() - ENUMINPUT handler
 * @file: file ptr
 * @priv: file handle
 * @input: ptr to input structure
 */
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;
}

/**
 * vpif_g_input() - Get INPUT handler
 * @file: file ptr
 * @priv: file handle
 * @index: ptr to input index
 */
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;
}

/**
 * vpif_s_input() - Set INPUT handler
 * @file: file ptr
 * @priv: file handle
 * @index: input index
 */
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);
}

/**
 * vpif_enum_fmt_vid_cap() - ENUM_FMT handler
 * @file: file ptr
 * @priv: file handle
 * @index: input 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;
}

/**
 * vpif_try_fmt_vid_cap() - TRY_FMT handler
 * @file: file ptr
 * @priv: file handle
 * @fmt: ptr to v4l2 format structure
 */
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);
}


/**
 * vpif_g_fmt_vid_cap() - Set INPUT handler
 * @file: file ptr
 * @priv: file handle
 * @fmt: ptr to v4l2 format structure
 */
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;
}

/**
 * vpif_s_fmt_vid_cap() - Set FMT handler
 * @file: file ptr
 * @priv: file handle
 * @fmt: ptr to v4l2 format structure
 */
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;
}

/**
 * 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_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;
}

/**
 * vpif_g_priority() - get priority handler
 * @file: file ptr
 * @priv: file handle
 * @prio: ptr to v4l2_priority structure
 */
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;
}

/**
 * vpif_s_priority() - set priority handler
 * @file: file ptr
 * @priv: file handle
 * @prio: ptr to v4l2_priority structure
 */
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_cropcap() - cropcap handler
 * @file: file ptr
 * @priv: file handle
 * @crop: ptr to v4l2_cropcap structure
 */
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;
}

/**
 * vpif_enum_dv_timings() - ENUM_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: input timings
 */
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;
}

/**
 * vpif_query_dv_timings() - QUERY_DV_TIMINGS handler
 * @file: file ptr
 * @priv: file handle
 * @timings: input timings
 */
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;
}

/**
 * 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->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;
}

/**
 * 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;

        *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,
};

/**
 * initialize_vpif() - Initialize vpif data structures
 *
 * Allocate memory for data structures and initialize them
 */
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;
}

/**
 * vpif_probe : This function probes the vpif capture driver
 * @pdev: platform device pointer
 *
 * This 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_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;
}

/**
 * vpif_remove() - driver remove handler
 * @device: ptr to platform device structure
 *
 * The vidoe device is unregistered
 */
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
/**
 * vpif_suspend: vpif device suspend
 */
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,
};

/**
 * vpif_init: initialize the vpif driver
 *
 * This function registers device and driver to the kernel, requests irq
 * handler and allocates memory
 * for channel objects
 */
static __init int vpif_init(void)
{
        return platform_driver_register(&vpif_driver);
}

/**
 * vpif_cleanup : This function clean up the vpif capture resources
 *
 * This will 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_CAPTURE_MAX_DEVICES; i++)
                kfree(vpif_obj.dev[i]);
}

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