/*
 * vpif-display - VPIF display driver
 * Display driver for TI DaVinci VPIF
 *
 * Copyright (C) 2009 Texas Instruments Incorporated - https://www.ti.com/
 * 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 version 2.
 *
 * This program is distributed .as is. WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

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

#include <media/v4l2-ioctl.h>

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

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

#define VPIF_V4L2_STD (V4L2_STD_525_60 | V4L2_STD_625_50)

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

static int debug = 1;

module_param(debug, int, 0644);

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

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

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

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

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 inline
struct vpif_disp_buffer *to_vpif_buffer(struct vb2_v4l2_buffer *vb)
{
        return container_of(vb, struct vpif_disp_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 channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
        struct common_obj *common;

        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;

        if (vb->vb2_queue->type != V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
                unsigned long addr = vb2_dma_contig_plane_dma_addr(vb, 0);

                if (!ISALIGNED(addr + common->ytop_off) ||
                        !ISALIGNED(addr + common->ybtm_off) ||
                        !ISALIGNED(addr + common->ctop_off) ||
                        !ISALIGNED(addr + common->cbtm_off)) {
                        vpif_err("buffer offset not aligned to 8 bytes\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;

        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
 *
 * This callback function queues the buffer to DMA engine
 */
static void vpif_buffer_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vpif_disp_buffer *buf = to_vpif_buffer(vbuf);
        struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
        struct common_obj *common;
        unsigned long flags;

        common = &ch->common[VPIF_VIDEO_INDEX];

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

/**
 * vpif_start_streaming : Starts the DMA engine for streaming
 * @vq: ptr to vb2_buffer
 * @count: number of buffers
 */
static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct vpif_display_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_disp_buffer *buf, *tmp;
        unsigned long addr, flags;
        int ret;

        spin_lock_irqsave(&common->irqlock, flags);

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

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

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

        ycmux_mode = ret;
        vpif_config_addr(ch, ret);
        /* Get the next frame from the buffer queue */
        common->next_frm = common->cur_frm =
                            list_entry(common->dma_queue.next,
                                       struct vpif_disp_buffer, list);

        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_CHANNEL2_VIDEO == ch->channel_id) {
                channel2_intr_assert();
                channel2_intr_enable(1);
                enable_channel2(1);
                if (vpif_config_data->chan_config[VPIF_CHANNEL2_VIDEO].clip_en)
                        channel2_clipping_enable(1);
        }

        if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
                channel3_intr_assert();
                channel3_intr_enable(1);
                enable_channel3(1);
                if (vpif_config_data->chan_config[VPIF_CHANNEL3_VIDEO].clip_en)
                        channel3_clipping_enable(1);
        }

        return 0;

err:
        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;

        common = &ch->common[VPIF_VIDEO_INDEX];

        /* Disable channel */
        if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
                enable_channel2(0);
                channel2_intr_enable(0);
        }
        if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
                enable_channel3(0);
                channel3_intr_enable(0);
        }

        /* release all active buffers */
        spin_lock_irqsave(&common->irqlock, flags);
        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);
        }

        while (!list_empty(&common->dma_queue)) {
                common->next_frm = list_entry(common->dma_queue.next,
                                                struct vpif_disp_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 const struct vb2_ops video_qops = {
        .queue_setup            = vpif_buffer_queue_setup,
        .wait_prepare           = vb2_ops_wait_prepare,
        .wait_finish            = vb2_ops_wait_finish,
        .buf_prepare            = vpif_buffer_prepare,
        .start_streaming        = vpif_start_streaming,
        .stop_streaming         = vpif_stop_streaming,
        .buf_queue              = vpif_buffer_queue,
};

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

        spin_lock(&common->irqlock);
        /* Get the next buffer from buffer queue */
        common->next_frm = list_entry(common->dma_queue.next,
                                struct vpif_disp_buffer, list);
        /* Remove that buffer from the buffer queue */
        list_del(&common->next_frm->list);
        spin_unlock(&common->irqlock);

        /* Set top and bottom field addrs in VPIF registers */
        addr = vb2_dma_contig_plane_dma_addr(&common->next_frm->vb.vb2_buf, 0);
        common->set_addr(addr + common->ytop_off,
                                 addr + common->ybtm_off,
                                 addr + common->ctop_off,
                                 addr + common->cbtm_off);
}

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

                /* one frame is displayed If next frame is
                 *  available, release cur_frm and move on */
                /* Copy frame display time */
                common->cur_frm->vb.vb2_buf.timestamp = ktime_get_ns();
                /* Change status of the cur_frm */
                vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
                                        VB2_BUF_STATE_DONE);
                /* Make cur_frm pointing to next_frm */
                common->cur_frm = common->next_frm;

        } 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);
                        return;
                }
                spin_unlock(&common->irqlock);
                /* one field is displayed configure the next
                 * frame if it is available else hold on current
                 * frame */
                /* Get next from the buffer queue */
                process_progressive_mode(common);
        }
}

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

        channel_id = *(int *)(dev_id);
        if (!vpif_intr_status(channel_id + 2))
                return IRQ_NONE;

        ch = dev->dev[channel_id];
        for (i = 0; i < VPIF_NUMOBJECTS; i++) {
                common = &ch->common[i];
                /* If streaming is started in this channel */

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

                        /* Progressive mode */
                        if (!channel_first_int[i][channel_id]) {
                                /* Mark status of the cur_frm to
                                 * done and unlock semaphore on it */
                                common->cur_frm->vb.vb2_buf.timestamp =
                                                ktime_get_ns();
                                vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
                                                VB2_BUF_STATE_DONE);
                                /* Make cur_frm pointing to next_frm */
                                common->cur_frm = common->next_frm;
                        }

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

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

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

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

        return IRQ_HANDLED;
}

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

        int i;

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

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

        return 0;
}

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

        if (!vid_ch->stdid && !vid_ch->dv_timings.bt.height)
                return -EINVAL;

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

        common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
        common->fmt.fmt.pix.width = std_info->width;
        common->fmt.fmt.pix.height = std_info->height;
        vpif_dbg(1, debug, "Pixel details: Width = %d,Height = %d\n",
                        common->fmt.fmt.pix.width, common->fmt.fmt.pix.height);

        /* Set height and width paramateres */
        common->height = std_info->height;
        common->width = std_info->width;
        common->fmt.fmt.pix.sizeimage = common->height * common->width * 2;

        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;

        return 0;
}

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

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

        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)) {
                common->ytop_off = 0;
                common->ybtm_off = hpitch;
                common->ctop_off = sizeimage / 2;
                common->cbtm_off = sizeimage / 2 + hpitch;
        } else if (V4L2_FIELD_SEQ_TB == vid_ch->buf_field) {
                common->ytop_off = 0;
                common->ybtm_off = sizeimage / 4;
                common->ctop_off = sizeimage / 2;
                common->cbtm_off = common->ctop_off + sizeimage / 4;
        } else if (V4L2_FIELD_SEQ_BT == vid_ch->buf_field) {
                common->ybtm_off = 0;
                common->ytop_off = sizeimage / 4;
                common->cbtm_off = sizeimage / 2;
                common->ctop_off = common->cbtm_off + sizeimage / 4;
        }

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

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

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

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

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

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

        strscpy(cap->driver, VPIF_DRIVER_NAME, sizeof(cap->driver));
        snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
                 dev_name(vpif_dev));
        strscpy(cap->card, config->card_name, sizeof(cap->card));

        return 0;
}

static int vpif_enum_fmt_vid_out(struct file *file, void  *priv,
                                        struct v4l2_fmtdesc *fmt)
{
        if (fmt->index != 0)
                return -EINVAL;

        /* Fill in the information about format */
        fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
        return 0;
}

static int vpif_g_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

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

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

static int vpif_try_fmt_vid_out(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 *pixfmt = &fmt->fmt.pix;

        /*
         * to suppress v4l-compliance warnings silently correct
         * the pixelformat
         */
        if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
                pixfmt->pixelformat = common->fmt.fmt.pix.pixelformat;

        if (vpif_update_resolution(ch))
                return -EINVAL;

        pixfmt->colorspace = common->fmt.fmt.pix.colorspace;
        pixfmt->field = common->fmt.fmt.pix.field;
        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;

        return 0;
}

static int vpif_s_fmt_vid_out(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 *pixfmt = &fmt->fmt.pix;
        int ret;

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

        ret = vpif_try_fmt_vid_out(file, priv, fmt);
        if (ret)
                return ret;

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

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

static int vpif_s_std(struct file *file, void *priv, v4l2_std_id std_id)
{
        struct vpif_display_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_display_chan_config *chan_cfg;
        struct v4l2_output output;
        int ret;

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

        chan_cfg = &config->chan_config[ch->channel_id];
        output = chan_cfg->outputs[ch->output_idx].output;
        if (output.capabilities != V4L2_OUT_CAP_STD)
                return -ENODATA;

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


        if (!(std_id & VPIF_V4L2_STD))
                return -EINVAL;

        /* 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_resolution(ch))
                return -EINVAL;

        common->fmt.fmt.pix.bytesperline = common->fmt.fmt.pix.width;

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

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

static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
        struct vpif_display_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_display_chan_config *chan_cfg;
        struct v4l2_output output;

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

        chan_cfg = &config->chan_config[ch->channel_id];
        output = chan_cfg->outputs[ch->output_idx].output;
        if (output.capabilities != V4L2_OUT_CAP_STD)
                return -ENODATA;

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

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

        struct vpif_display_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_display_chan_config *chan_cfg;

        chan_cfg = &config->chan_config[ch->channel_id];
        if (output->index >= chan_cfg->output_count) {
                vpif_dbg(1, debug, "Invalid output index\n");
                return -EINVAL;
        }

        *output = chan_cfg->outputs[output->index].output;
        return 0;
}

/**
 * vpif_output_to_subdev() - Maps output to sub device
 * @vpif_cfg: global config ptr
 * @chan_cfg: channel config ptr
 * @index: Given output index from application
 *
 * lookup the sub device information for a given output index.
 * we report all the output to application. output table also
 * has sub device name for the each output
 */
static int
vpif_output_to_subdev(struct vpif_display_config *vpif_cfg,
                      struct vpif_display_chan_config *chan_cfg, int index)
{
        struct vpif_subdev_info *subdev_info;
        const char *subdev_name;
        int i;

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

        if (!chan_cfg->outputs)
                return -1;

        subdev_name = chan_cfg->outputs[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->subdevinfo[i];
                if (!strcmp(subdev_info->name, subdev_name))
                        return i;
        }
        return -1;
}

/**
 * vpif_set_output() - Select an output
 * @vpif_cfg: global config ptr
 * @ch: channel
 * @index: Given output index from application
 *
 * Select the given output.
 */
static int vpif_set_output(struct vpif_display_config *vpif_cfg,
                      struct channel_obj *ch, int index)
{
        struct vpif_display_chan_config *chan_cfg =
                &vpif_cfg->chan_config[ch->channel_id];
        struct v4l2_subdev *sd = NULL;
        u32 input = 0, output = 0;
        int sd_index;
        int ret;

        sd_index = vpif_output_to_subdev(vpif_cfg, chan_cfg, index);
        if (sd_index >= 0)
                sd = vpif_obj.sd[sd_index];

        if (sd) {
                input = chan_cfg->outputs[index].input_route;
                output = chan_cfg->outputs[index].output_route;
                ret = v4l2_subdev_call(sd, video, s_routing, input, output, 0);
                if (ret < 0 && ret != -ENOIOCTLCMD) {
                        vpif_err("Failed to set output\n");
                        return ret;
                }

        }
        ch->output_idx = index;
        ch->sd = sd;
        if (chan_cfg->outputs)
                /* update tvnorms from the sub device output info */
                ch->video_dev.tvnorms = chan_cfg->outputs[index].output.std;
        return 0;
}

static int vpif_s_output(struct file *file, void *priv, unsigned int i)
{
        struct vpif_display_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_display_chan_config *chan_cfg;
        struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];

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

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

        if (i >= chan_cfg->output_count)
                return -EINVAL;

        return vpif_set_output(config, ch, i);
}

static int vpif_g_output(struct file *file, void *priv, unsigned int *i)
{
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);

        *i = ch->output_idx;

        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_display_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_display_chan_config *chan_cfg;
        struct v4l2_output output;
        int ret;

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

        chan_cfg = &config->chan_config[ch->channel_id];
        output = chan_cfg->outputs[ch->output_idx].output;
        if (output.capabilities != V4L2_OUT_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_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_display_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 common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
        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;
        struct vpif_display_chan_config *chan_cfg;
        struct v4l2_output output;
        int ret;

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

        chan_cfg = &config->chan_config[ch->channel_id];
        output = chan_cfg->outputs[ch->output_idx].output;
        if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
                return -ENODATA;

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

        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 = 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);
        }
        strscpy(std_info->name, "Custom timings BT656/1120",
                sizeof(std_info->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_display_config *config = vpif_dev->platform_data;
        struct video_device *vdev = video_devdata(file);
        struct channel_obj *ch = video_get_drvdata(vdev);
        struct vpif_display_chan_config *chan_cfg;
        struct video_obj *vid_ch = &ch->video;
        struct v4l2_output output;

        if (!config->chan_config[ch->channel_id].outputs)
                goto error;

        chan_cfg = &config->chan_config[ch->channel_id];
        output = chan_cfg->outputs[ch->output_idx].output;

        if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
                goto error;

        *timings = vid_ch->dv_timings;

        return 0;
error:
        return -ENODATA;
}

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

        return 0;
}

/* vpif display ioctl operations */
static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
        .vidioc_querycap                = vpif_querycap,
        .vidioc_enum_fmt_vid_out        = vpif_enum_fmt_vid_out,
        .vidioc_g_fmt_vid_out           = vpif_g_fmt_vid_out,
        .vidioc_s_fmt_vid_out           = vpif_s_fmt_vid_out,
        .vidioc_try_fmt_vid_out         = vpif_try_fmt_vid_out,

        .vidioc_reqbufs                 = 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_s_std                   = vpif_s_std,
        .vidioc_g_std                   = vpif_g_std,

        .vidioc_enum_output             = vpif_enum_output,
        .vidioc_s_output                = vpif_s_output,
        .vidioc_g_output                = vpif_g_output,

        .vidioc_enum_dv_timings         = vpif_enum_dv_timings,
        .vidioc_s_dv_timings            = vpif_s_dv_timings,
        .vidioc_g_dv_timings            = vpif_g_dv_timings,

        .vidioc_log_status              = vpif_log_status,
};

static const 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
};

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

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

        return 0;

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

static void free_vpif_objs(void)
{
        int i;

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

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_DISPLAY_MAX_DEVICES; j++) {
                ch = vpif_obj.dev[j];
                /* Initialize field of the channel objects */
                for (k = 0; k < VPIF_NUMOBJECTS; k++) {
                        common = &ch->common[k];
                        spin_lock_init(&common->irqlock);
                        mutex_init(&common->lock);
                        common->set_addr = NULL;
                        common->ytop_off = 0;
                        common->ybtm_off = 0;
                        common->ctop_off = 0;
                        common->cbtm_off = 0;
                        common->cur_frm = NULL;
                        common->next_frm = NULL;
                        memset(&common->fmt, 0, sizeof(common->fmt));
                }
                ch->initialized = 0;
                if (vpif_obj.config->subdev_count)
                        ch->sd = vpif_obj.sd[0];
                ch->channel_id = j;

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

                ch->common[VPIF_VIDEO_INDEX].fmt.type =
                                                V4L2_BUF_TYPE_VIDEO_OUTPUT;

                /* select output 0 */
                err = vpif_set_output(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));
                vpif_update_resolution(ch);

                /* Initialize vb2 queue */
                q = &common->buffer_queue;
                q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
                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_disp_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_display: vb2_queue_init() failed\n");
                        goto probe_out;
                }

                INIT_LIST_HEAD(&common->dma_queue);

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

                /* Initialize the video_device structure */
                vdev = &ch->video_dev;
                strscpy(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_TX;
                vdev->queue = q;
                vdev->lock = &common->lock;
                vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
                video_set_drvdata(&ch->video_dev, ch);
                err = video_register_device(vdev, VFL_TYPE_VIDEO,
                                            (j ? 3 : 2));
                if (err < 0)
                        goto probe_out;
        }

        return 0;

probe_out:
        for (k = 0; k < j; k++) {
                ch = vpif_obj.dev[k];
                video_unregister_device(&ch->video_dev);
        }
        return err;
}

/*
 * vpif_probe: This function creates device entries by register itself to the
 * V4L2 driver and initializes fields of each channel objects
 */
static __init int vpif_probe(struct platform_device *pdev)
{
        struct vpif_subdev_info *subdevdata;
        struct i2c_adapter *i2c_adap;
        struct resource *res;
        int subdev_count;
        int res_idx = 0;
        int i, err;

        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");
                goto vpif_free;
        }

        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;
                        vpif_err("VPIF IRQ request failed\n");
                        goto vpif_unregister;
                }
                res_idx++;
        }

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

        i2c_adap = i2c_get_adapter(vpif_obj.config->i2c_adapter_id);
        for (i = 0; i < subdev_count; i++) {
                vpif_obj.sd[i] =
                        v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
                                                  i2c_adap,
                                                  &subdevdata[i].board_info,
                                                  NULL);
                if (!vpif_obj.sd[i]) {
                        vpif_err("Error registering v4l2 subdevice\n");
                        err = -ENODEV;
                        goto probe_subdev_out;
                }

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

        return 0;

probe_subdev_out:
        kfree(vpif_obj.sd);
vpif_unregister:
        v4l2_device_unregister(&vpif_obj.v4l2_dev);
vpif_free:
        free_vpif_objs();

        return err;
}

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

        v4l2_device_unregister(&vpif_obj.v4l2_dev);

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

        return 0;
}

#ifdef CONFIG_PM_SLEEP
static int vpif_suspend(struct device *dev)
{
        struct common_obj *common;
        struct channel_obj *ch;
        int i;

        for (i = 0; i < VPIF_DISPLAY_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_CHANNEL2_VIDEO) {
                        enable_channel2(0);
                        channel2_intr_enable(0);
                }
                if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
                        ycmux_mode == 2) {
                        enable_channel3(0);
                        channel3_intr_enable(0);
                }
                mutex_unlock(&common->lock);
        }

        return 0;
}

static int vpif_resume(struct device *dev)
{

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

        for (i = 0; i < VPIF_DISPLAY_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_CHANNEL2_VIDEO) {
                        enable_channel2(1);
                        channel2_intr_enable(1);
                }
                if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
                                ycmux_mode == 2) {
                        enable_channel3(1);
                        channel3_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);