powerpc/mm: Ensure cpumask update is ordered

[mirror_ubuntu-artful-kernel.git] / drivers / media / platform / davinci / vpif_capture.c

/*
 * Copyright (C) 2009 Texas Instruments Inc
 * Copyright (C) 2014 Lad, Prabhakar <prabhakar.csengg@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; 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.
 *
 * TODO : add support for VBI & HBI data service
 *        add static buffer allocation
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <media/v4l2-fwnode.h>
#include <media/v4l2-ioctl.h>
#include <media/i2c/tvp514x.h>
#include <media/v4l2-mediabus.h>

#include <linux/videodev2.h>

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

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "Debug level 0-1");

#define VPIF_DRIVER_NAME        "vpif_capture"
MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);

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

/* Is set to 1 in case of SDTV formats, 2 in case of HDTV formats. */
static int ycmux_mode;

static inline
struct vpif_cap_buffer *to_vpif_buffer(struct vb2_v4l2_buffer *vb)
{
        return container_of(vb, struct vpif_cap_buffer, vb);
}

/**
 * vpif_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)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vb2_queue *q = vb->vb2_queue;
        struct channel_obj *ch = vb2_get_drv_priv(q);
        struct common_obj *common;
        unsigned long addr;

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

        common = &ch->common[VPIF_VIDEO_INDEX];

        vb2_set_plane_payload(vb, 0, common->fmt.fmt.pix.sizeimage);
        if (vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
                return -EINVAL;

        vbuf->field = common->fmt.fmt.pix.field;

        addr = vb2_dma_contig_plane_dma_addr(vb, 0);
        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)) {
                vpif_dbg(1, debug, "offset is not aligned\n");
                return -EINVAL;
        }

        return 0;
}

/**
 * vpif_buffer_queue_setup : Callback function for buffer setup.
 * @vq: vb2_queue ptr
 * @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_devs: 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,
                                unsigned int *nbuffers, unsigned int *nplanes,
                                unsigned int sizes[], struct device *alloc_devs[])
{
        struct channel_obj *ch = vb2_get_drv_priv(vq);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        unsigned size = common->fmt.fmt.pix.sizeimage;

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

        if (*nplanes) {
                if (sizes[0] < size)
                        return -EINVAL;
                size = sizes[0];
        }

        if (vq->num_buffers + *nbuffers < 3)
                *nbuffers = 3 - vq->num_buffers;

        *nplanes = 1;
        sizes[0] = size;

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

        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)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
        struct vpif_cap_buffer *buf = to_vpif_buffer(vbuf);
        struct common_obj *common;
        unsigned long flags;

        common = &ch->common[VPIF_VIDEO_INDEX];

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

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

/**
 * vpif_start_streaming : Starts the DMA engine for streaming
 * @vb: ptr to vb2_buffer
 * @count: number of buffers
 */
static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct vpif_capture_config *vpif_config_data =
                                        vpif_dev->platform_data;
        struct channel_obj *ch = vb2_get_drv_priv(vq);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct vpif_params *vpif = &ch->vpifparams;
        struct vpif_cap_buffer *buf, *tmp;
        unsigned long addr, flags;
        int ret;

        /* Initialize field_id */
        ch->field_id = 0;

        /* 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");
                        goto err;
                }
        }

        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");
                goto err;
        }

        /* 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");
                goto err;
        }

        ycmux_mode = ret;
        vpif_config_addr(ch, ret);

        /* Get the next frame from the buffer queue */
        spin_lock_irqsave(&common->irqlock, flags);
        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);
        spin_unlock_irqrestore(&common->irqlock, flags);

        addr = vb2_dma_contig_plane_dma_addr(&common->cur_frm->vb.vb2_buf, 0);

        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 ||
                ycmux_mode == 2) {
                channel1_intr_assert();
                channel1_intr_enable(1);
                enable_channel1(1);
        }

        return 0;

err:
        spin_lock_irqsave(&common->irqlock, flags);
        list_for_each_entry_safe(buf, tmp, &common->dma_queue, list) {
                list_del(&buf->list);
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
        }
        spin_unlock_irqrestore(&common->irqlock, flags);

        return ret;
}

/**
 * vpif_stop_streaming : Stop the DMA engine
 * @vq: ptr to vb2_queue
 *
 * This callback stops the DMA engine and any remaining buffers
 * in the DMA queue are released.
 */
static void vpif_stop_streaming(struct vb2_queue *vq)
{
        struct channel_obj *ch = vb2_get_drv_priv(vq);
        struct common_obj *common;
        unsigned long flags;
        int ret;

        common = &ch->common[VPIF_VIDEO_INDEX];

        /* 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 ||
                ycmux_mode == 2) {
                enable_channel1(0);
                channel1_intr_enable(0);
        }

        ycmux_mode = 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");

        /* release all active buffers */
        if (common->cur_frm == common->next_frm) {
                vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
                                VB2_BUF_STATE_ERROR);
        } else {
                if (common->cur_frm)
                        vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
                                        VB2_BUF_STATE_ERROR);
                if (common->next_frm)
                        vb2_buffer_done(&common->next_frm->vb.vb2_buf,
                                        VB2_BUF_STATE_ERROR);
        }

        spin_lock_irqsave(&common->irqlock, flags);
        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,
                                VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&common->irqlock, flags);
}

static struct vb2_ops video_qops = {
        .queue_setup            = vpif_buffer_queue_setup,
        .buf_prepare            = vpif_buffer_prepare,
        .start_streaming        = vpif_start_streaming,
        .stop_streaming         = vpif_stop_streaming,
        .buf_queue              = vpif_buffer_queue,
        .wait_prepare           = vb2_ops_wait_prepare,
        .wait_finish            = vb2_ops_wait_finish,
};

/**
 * 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)
{
        common->cur_frm->vb.vb2_buf.timestamp = ktime_get_ns();
        vb2_buffer_done(&common->cur_frm->vb.vb2_buf, 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;

        spin_lock(&common->irqlock);
        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);
        spin_unlock(&common->irqlock);
        addr = vb2_dma_contig_plane_dma_addr(&common->next_frm->vb.vb2_buf, 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;
        int channel_id;
        int fid = -1, i;

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

        ch = dev->dev[channel_id];

        for (i = 0; i < VPIF_NUMBER_OF_OBJECTS; i++) {
                common = &ch->common[i];
                /* skip If streaming is not started in this channel */
                /* Check the field format */
                if (1 == ch->vpifparams.std_info.frm_fmt ||
                    common->fmt.fmt.pix.field == V4L2_FIELD_NONE) {
                        /* Progressive mode */
                        spin_lock(&common->irqlock);
                        if (list_empty(&common->dma_queue)) {
                                spin_unlock(&common->irqlock);
                                continue;
                        }
                        spin_unlock(&common->irqlock);

                        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 */
                                spin_lock(&common->irqlock);
                                if (list_empty(&common->dma_queue) ||
                                    (common->cur_frm != common->next_frm)) {
                                        spin_unlock(&common->irqlock);
                                        continue;
                                }
                                spin_unlock(&common->irqlock);

                                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;
        struct v4l2_pix_format *pixfmt = &common->fmt.fmt.pix;

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

        /*
         * if called after try_fmt or g_fmt, there will already be a size
         * so use that by default.
         */
        if (pixfmt->width && pixfmt->height) {
                if (pixfmt->field == V4L2_FIELD_ANY ||
                    pixfmt->field == V4L2_FIELD_NONE)
                        pixfmt->field = V4L2_FIELD_NONE;

                vpifparams->iface.if_type = VPIF_IF_BT656;
                if (pixfmt->pixelformat == V4L2_PIX_FMT_SGRBG10 ||
                    pixfmt->pixelformat == V4L2_PIX_FMT_SBGGR8)
                        vpifparams->iface.if_type = VPIF_IF_RAW_BAYER;

                if (pixfmt->pixelformat == V4L2_PIX_FMT_SGRBG10)
                        vpifparams->params.data_sz = 1; /* 10 bits/pixel.  */

                /*
                 * For raw formats from camera sensors, we don't need
                 * the std_info from table lookup, so nothing else to do here.
                 */
                if (vpifparams->iface.if_type == VPIF_IF_RAW_BAYER) {
                        memset(std_info, 0, sizeof(struct vpif_channel_config_params));
                        vpifparams->std_info.capture_format = 1; /* CCD/raw mode */
                        return 0;
                }
        }

        for (index = 0; index < vpif_ch_params_count; index++) {
                config = &vpif_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.sizeimage = common->height * common->width * 2;
        common->fmt.fmt.pix.bytesperline = std_info->width;
        vpifparams->video_params.hpitch = std_info->width;
        vpifparams->video_params.storage_mode = std_info->frm_fmt;

        if (vid_ch->stdid)
                common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
        else
                common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_REC709;

        if (ch->vpifparams.std_info.frm_fmt)
                common->fmt.fmt.pix.field = V4L2_FIELD_NONE;
        else
                common->fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;

        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_NV16;

        common->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        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, 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;

        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_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_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_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");

        if (!chan_cfg)
                return -1;
        if (input_index >= chan_cfg->input_count)
                return -1;
        subdev_name = chan_cfg->inputs[input_index].subdev_name;
        if (!subdev_name)
                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 (subdev_info && !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];
        } else {
                /* no subdevice, no input to setup */
                return 0;
        }

        /* 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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        int ret;

        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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;

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

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_STD)
                return -ENODATA;

        *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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;
        int ret;

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

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_STD)
                return -ENODATA;

        if (vb2_is_busy(&common->buffer_queue))
                return -EBUSY;

        /* 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;
        }

        /* set standard in the sub device */
        ret = v4l2_subdev_call(ch->sd, video, 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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_capture_chan_config *chan_cfg;

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

        if (input->index >= chan_cfg->input_count)
                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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);

        *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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct vpif_capture_chan_config *chan_cfg;

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

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

        if (vb2_is_busy(&common->buffer_queue))
                return -EBUSY;

        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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);

        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 Semi-Planar");
                fmt->pixelformat = V4L2_PIX_FMT_NV16;
        }
        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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
        struct common_obj *common = &(ch->common[VPIF_VIDEO_INDEX]);

        common->fmt = *fmt;
        vpif_update_std_info(ch);

        pixfmt->field = common->fmt.fmt.pix.field;
        pixfmt->colorspace = common->fmt.fmt.pix.colorspace;
        pixfmt->bytesperline = common->fmt.fmt.pix.width;
        pixfmt->width = common->fmt.fmt.pix.width;
        pixfmt->height = common->fmt.fmt.pix.height;
        pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height * 2;
        if (pixfmt->pixelformat == V4L2_PIX_FMT_SGRBG10) {
                pixfmt->bytesperline = common->fmt.fmt.pix.width * 2;
                pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
        }
        pixfmt->priv = 0;

        dev_dbg(vpif_dev, "%s: %d x %d; pitch=%d pixelformat=0x%08x, field=%d, size=%d\n", __func__,
                pixfmt->width, pixfmt->height,
                pixfmt->bytesperline, pixfmt->pixelformat,
                pixfmt->field, pixfmt->sizeimage);

        return 0;
}


/**
 * 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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct v4l2_pix_format *pix_fmt = &fmt->fmt.pix;
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        struct v4l2_mbus_framefmt *mbus_fmt = &format.format;
        int ret;

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

        /* By default, use currently set fmt */
        *fmt = common->fmt;

        /* If subdev has get_fmt, use that to override */
        ret = v4l2_subdev_call(ch->sd, pad, get_fmt, NULL, &format);
        if (!ret && mbus_fmt->code) {
                v4l2_fill_pix_format(pix_fmt, mbus_fmt);
                pix_fmt->bytesperline = pix_fmt->width;
                if (mbus_fmt->code == MEDIA_BUS_FMT_SGRBG10_1X10) {
                        /* e.g. mt9v032 */
                        pix_fmt->pixelformat = V4L2_PIX_FMT_SGRBG10;
                        pix_fmt->bytesperline = pix_fmt->width * 2;
                } else if (mbus_fmt->code == MEDIA_BUS_FMT_UYVY8_2X8) {
                        /* e.g. tvp514x */
                        pix_fmt->pixelformat = V4L2_PIX_FMT_NV16;
                        pix_fmt->bytesperline = pix_fmt->width * 2;
                } else {
                        dev_warn(vpif_dev, "%s: Unhandled media-bus format 0x%x\n",
                                 __func__, mbus_fmt->code);
                }
                pix_fmt->sizeimage = pix_fmt->bytesperline * pix_fmt->height;
                dev_dbg(vpif_dev, "%s: %d x %d; pitch=%d, pixelformat=0x%08x, code=0x%x, field=%d, size=%d\n", __func__,
                        pix_fmt->width, pix_fmt->height,
                        pix_fmt->bytesperline, pix_fmt->pixelformat,
                        mbus_fmt->code, pix_fmt->field, pix_fmt->sizeimage);

                common->fmt = *fmt;
                vpif_update_std_info(ch);
        }

        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 video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        int ret;

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

        if (vb2_is_busy(&common->buffer_queue))
                return -EBUSY;

        ret = vpif_try_fmt_vid_cap(file, priv, fmt);
        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;
        strlcpy(cap->driver, VPIF_DRIVER_NAME, sizeof(cap->driver));
        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_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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;
        int ret;

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_DV_TIMINGS)
                return -ENODATA;

        timings->pad = 0;

        ret = v4l2_subdev_call(ch->sd, pad, 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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;
        int ret;

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_DV_TIMINGS)
                return -ENODATA;

        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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_params *vpifparams = &ch->vpifparams;
        struct vpif_channel_config_params *std_info = &vpifparams->std_info;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        struct video_obj *vid_ch = &ch->video;
        struct v4l2_bt_timings *bt = &vid_ch->dv_timings.bt;
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;
        int ret;

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_DV_TIMINGS)
                return -ENODATA;

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

        if (vb2_is_busy(&common->buffer_queue))
                return -EBUSY;

        /* 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 = V4L2_DV_BT_BLANKING_WIDTH(bt) - 8;
        std_info->sav2eav = bt->width;

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

        std_info->vsize = V4L2_DV_BT_FRAME_HEIGHT(bt);
        if (bt->interlaced) {
                if (bt->il_vbackporch || bt->il_vfrontporch || bt->il_vsync) {
                        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->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_capture_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct video_obj *vid_ch = &ch->video;
        struct vpif_capture_chan_config *chan_cfg;
        struct v4l2_input input;

        if (!config->chan_config[ch->channel_id].inputs)
                return -ENODATA;

        chan_cfg = &config->chan_config[ch->channel_id];
        input = chan_cfg->inputs[ch->input_idx].input;
        if (input.capabilities != V4L2_IN_CAP_DV_TIMINGS)
                return -ENODATA;

        *timings = vid_ch->dv_timings;

        return 0;
}

/*
 * 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_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                 = vb2_ioctl_reqbufs,
        .vidioc_create_bufs             = vb2_ioctl_create_bufs,
        .vidioc_querybuf                = vb2_ioctl_querybuf,
        .vidioc_qbuf                    = vb2_ioctl_qbuf,
        .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
        .vidioc_expbuf                  = vb2_ioctl_expbuf,
        .vidioc_streamon                = vb2_ioctl_streamon,
        .vidioc_streamoff               = vb2_ioctl_streamoff,

        .vidioc_querystd                = vpif_querystd,
        .vidioc_s_std                   = vpif_s_std,
        .vidioc_g_std                   = vpif_g_std,

        .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_log_status              = vpif_log_status,
};

/* vpif file operations */
static struct v4l2_file_operations vpif_fops = {
        .owner = THIS_MODULE,
        .open = v4l2_fh_open,
        .release = vb2_fop_release,
        .unlocked_ioctl = video_ioctl2,
        .mmap = vb2_fop_mmap,
        .poll = vb2_fop_poll
};

/**
 * initialize_vpif() - Initialize vpif data structures
 *
 * Allocate memory for data structures and initialize them
 */
static int initialize_vpif(void)
{
        int err, i, j;
        int free_channel_objects_index;

        /* 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 int vpif_async_bound(struct v4l2_async_notifier *notifier,
                            struct v4l2_subdev *subdev,
                            struct v4l2_async_subdev *asd)
{
        int i;

        for (i = 0; i < vpif_obj.config->asd_sizes[0]; i++) {
                struct v4l2_async_subdev *_asd = vpif_obj.config->asd[i];
                const struct fwnode_handle *fwnode = _asd->match.fwnode.fwnode;

                if (fwnode == subdev->fwnode) {
                        vpif_obj.sd[i] = subdev;
                        vpif_obj.config->chan_config->inputs[i].subdev_name =
                                (char *)to_of_node(subdev->fwnode)->full_name;
                        vpif_dbg(2, debug,
                                 "%s: setting input %d subdev_name = %s\n",
                                 __func__, i,
                                 to_of_node(subdev->fwnode)->full_name);
                        return 0;
                }
        }

        for (i = 0; i < vpif_obj.config->subdev_count; i++)
                if (!strcmp(vpif_obj.config->subdev_info[i].name,
                            subdev->name)) {
                        vpif_obj.sd[i] = subdev;
                        return 0;
                }

        return -EINVAL;
}

static int vpif_probe_complete(void)
{
        struct common_obj *common;
        struct video_device *vdev;
        struct channel_obj *ch;
        struct vb2_queue *q;
        int j, err, k;

        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);

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

                /* set initial format */
                ch->video.stdid = V4L2_STD_525_60;
                memset(&ch->video.dv_timings, 0, sizeof(ch->video.dv_timings));
                common->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
                vpif_update_std_info(ch);

                /* Initialize vb2 queue */
                q = &common->buffer_queue;
                q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
                q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
                q->drv_priv = ch;
                q->ops = &video_qops;
                q->mem_ops = &vb2_dma_contig_memops;
                q->buf_struct_size = sizeof(struct vpif_cap_buffer);
                q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
                q->min_buffers_needed = 1;
                q->lock = &common->lock;
                q->dev = vpif_dev;

                err = vb2_queue_init(q);
                if (err) {
                        vpif_err("vpif_capture: vb2_queue_init() failed\n");
                        goto probe_out;
                }

                INIT_LIST_HEAD(&common->dma_queue);

                /* Initialize the video_device structure */
                vdev = &ch->video_dev;
                strlcpy(vdev->name, VPIF_DRIVER_NAME, sizeof(vdev->name));
                vdev->release = video_device_release_empty;
                vdev->fops = &vpif_fops;
                vdev->ioctl_ops = &vpif_ioctl_ops;
                vdev->v4l2_dev = &vpif_obj.v4l2_dev;
                vdev->vfl_dir = VFL_DIR_RX;
                vdev->queue = q;
                vdev->lock = &common->lock;
                video_set_drvdata(&ch->video_dev, ch);
                err = video_register_device(vdev,
                                            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];
                common = &ch->common[k];
                /* Unregister video device */
                video_unregister_device(&ch->video_dev);
        }
        kfree(vpif_obj.sd);
        v4l2_device_unregister(&vpif_obj.v4l2_dev);

        return err;
}

static int vpif_async_complete(struct v4l2_async_notifier *notifier)
{
        return vpif_probe_complete();
}

static struct vpif_capture_config *
vpif_capture_get_pdata(struct platform_device *pdev)
{
        struct device_node *endpoint = NULL;
        struct v4l2_fwnode_endpoint bus_cfg;
        struct vpif_capture_config *pdata;
        struct vpif_subdev_info *sdinfo;
        struct vpif_capture_chan_config *chan;
        unsigned int i;

        /*
         * DT boot: OF node from parent device contains
         * video ports & endpoints data.
         */
        if (pdev->dev.parent && pdev->dev.parent->of_node)
                pdev->dev.of_node = pdev->dev.parent->of_node;
        if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
                return pdev->dev.platform_data;

        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
        if (!pdata)
                return NULL;
        pdata->subdev_info =
                devm_kzalloc(&pdev->dev, sizeof(*pdata->subdev_info) *
                             VPIF_CAPTURE_NUM_CHANNELS, GFP_KERNEL);

        if (!pdata->subdev_info)
                return NULL;

        for (i = 0; i < VPIF_CAPTURE_NUM_CHANNELS; i++) {
                struct device_node *rem;
                unsigned int flags;
                int err;

                endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
                                                      endpoint);
                if (!endpoint)
                        break;

                sdinfo = &pdata->subdev_info[i];
                chan = &pdata->chan_config[i];
                chan->inputs = devm_kzalloc(&pdev->dev,
                                            sizeof(*chan->inputs) *
                                            VPIF_CAPTURE_NUM_CHANNELS,
                                            GFP_KERNEL);

                chan->input_count++;
                chan->inputs[i].input.type = V4L2_INPUT_TYPE_CAMERA;
                chan->inputs[i].input.std = V4L2_STD_ALL;
                chan->inputs[i].input.capabilities = V4L2_IN_CAP_STD;

                err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(endpoint),
                                                 &bus_cfg);
                if (err) {
                        dev_err(&pdev->dev, "Could not parse the endpoint\n");
                        goto done;
                }
                dev_dbg(&pdev->dev, "Endpoint %s, bus_width = %d\n",
                        endpoint->full_name, bus_cfg.bus.parallel.bus_width);
                flags = bus_cfg.bus.parallel.flags;

                if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
                        chan->vpif_if.hd_pol = 1;

                if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
                        chan->vpif_if.vd_pol = 1;

                rem = of_graph_get_remote_port_parent(endpoint);
                if (!rem) {
                        dev_dbg(&pdev->dev, "Remote device at %s not found\n",
                                endpoint->full_name);
                        goto done;
                }

                dev_dbg(&pdev->dev, "Remote device %s, %s found\n",
                        rem->name, rem->full_name);
                sdinfo->name = rem->full_name;

                pdata->asd[i] = devm_kzalloc(&pdev->dev,
                                             sizeof(struct v4l2_async_subdev),
                                             GFP_KERNEL);
                if (!pdata->asd[i]) {
                        of_node_put(rem);
                        pdata = NULL;
                        goto done;
                }

                pdata->asd[i]->match_type = V4L2_ASYNC_MATCH_FWNODE;
                pdata->asd[i]->match.fwnode.fwnode = of_fwnode_handle(rem);
                of_node_put(rem);
        }

done:
        pdata->asd_sizes[0] = i;
        pdata->subdev_count = i;
        pdata->card_name = "DA850/OMAP-L138 Video Capture";

        return pdata;
}

/**
 * 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 i2c_adapter *i2c_adap;
        struct resource *res;
        int subdev_count;
        int res_idx = 0;
        int i, err;

        pdev->dev.platform_data = vpif_capture_get_pdata(pdev);
        if (!pdev->dev.platform_data) {
                dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
                return -EINVAL;
        }

        if (!pdev->dev.platform_data) {
                dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
                return -EINVAL;
        }

        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))) {
                err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
                                        IRQF_SHARED, VPIF_DRIVER_NAME,
                                        (void *)(&vpif_obj.dev[res_idx]->
                                        channel_id));
                if (err) {
                        err = -EINVAL;
                        goto vpif_unregister;
                }
                res_idx++;
        }

        vpif_obj.config = pdev->dev.platform_data;

        subdev_count = vpif_obj.config->subdev_count;
        vpif_obj.sd = kcalloc(subdev_count, sizeof(*vpif_obj.sd), GFP_KERNEL);
        if (!vpif_obj.sd) {
                err = -ENOMEM;
                goto vpif_unregister;
        }

        if (!vpif_obj.config->asd_sizes[0]) {
                int i2c_id = vpif_obj.config->i2c_adapter_id;

                i2c_adap = i2c_get_adapter(i2c_id);
                WARN_ON(!i2c_adap);
                for (i = 0; i < subdev_count; i++) {
                        subdevdata = &vpif_obj.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");
                                err = -ENODEV;
                                goto probe_subdev_out;
                        }
                        v4l2_info(&vpif_obj.v4l2_dev,
                                  "registered sub device %s\n",
                                   subdevdata->name);
                }
                vpif_probe_complete();
        } else {
                vpif_obj.notifier.subdevs = vpif_obj.config->asd;
                vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
                vpif_obj.notifier.bound = vpif_async_bound;
                vpif_obj.notifier.complete = vpif_async_complete;
                err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
                                                   &vpif_obj.notifier);
                if (err) {
                        vpif_err("Error registering async notifier\n");
                        err = -EINVAL;
                        goto probe_subdev_out;
                }
        }

        return 0;

probe_subdev_out:
        /* free sub devices memory */
        kfree(vpif_obj.sd);
vpif_unregister:
        v4l2_device_unregister(&vpif_obj.v4l2_dev);

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

        v4l2_device_unregister(&vpif_obj.v4l2_dev);

        kfree(vpif_obj.sd);
        /* un-register device */
        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];
                /* Unregister video device */
                video_unregister_device(&ch->video_dev);
                kfree(vpif_obj.dev[i]);
        }
        return 0;
}

#ifdef CONFIG_PM_SLEEP
/**
 * 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];

                if (!vb2_start_streaming_called(&common->buffer_queue))
                        continue;

                mutex_lock(&common->lock);
                /* Disable channel */
                if (ch->channel_id == VPIF_CHANNEL0_VIDEO) {
                        enable_channel0(0);
                        channel0_intr_enable(0);
                }
                if (ch->channel_id == VPIF_CHANNEL1_VIDEO ||
                        ycmux_mode == 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];

                if (!vb2_start_streaming_called(&common->buffer_queue))
                        continue;

                mutex_lock(&common->lock);
                /* Enable channel */
                if (ch->channel_id == VPIF_CHANNEL0_VIDEO) {
                        enable_channel0(1);
                        channel0_intr_enable(1);
                }
                if (ch->channel_id == VPIF_CHANNEL1_VIDEO ||
                        ycmux_mode == 2) {
                        enable_channel1(1);
                        channel1_intr_enable(1);
                }
                mutex_unlock(&common->lock);
        }

        return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(vpif_pm_ops, vpif_suspend, vpif_resume);

static __refdata struct platform_driver vpif_driver = {
        .driver = {
                .name   = VPIF_DRIVER_NAME,
                .pm     = &vpif_pm_ops,
        },
        .probe = vpif_probe,
        .remove = vpif_remove,
};

module_platform_driver(vpif_driver);