/*
 *  tw68 functions to handle video data
 *
 *  Much of this code is derived from the cx88 and sa7134 drivers, which
 *  were in turn derived from the bt87x driver.  The original work was by
 *  Gerd Knorr; more recently the code was enhanced by Mauro Carvalho Chehab,
 *  Hans Verkuil, Andy Walls and many others.  Their work is gratefully
 *  acknowledged.  Full credit goes to them - any problems within this code
 *  are mine.
 *
 *  Copyright (C) 2009  William M. Brack
 *
 *  Refactored and updated to the latest v4l core frameworks:
 *
 *  Copyright (C) 2014 Hans Verkuil <hverkuil@xs4all.nl>
 *
 *  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.
 */

#include <linux/module.h>
#include <media/v4l2-common.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-dma-sg.h>

#include "tw68.h"
#include "tw68-reg.h"

/* ------------------------------------------------------------------ */
/* data structs for video                                             */
/*
 * FIXME -
 * Note that the saa7134 has formats, e.g. YUV420, which are classified
 * as "planar".  These affect overlay mode, and are flagged with a field
 * ".planar" in the format.  Do we need to implement this in this driver?
 */
static const struct tw68_format formats[] = {
        {
                .name           = "15 bpp RGB, le",
                .fourcc         = V4L2_PIX_FMT_RGB555,
                .depth          = 16,
                .twformat       = ColorFormatRGB15,
        }, {
                .name           = "15 bpp RGB, be",
                .fourcc         = V4L2_PIX_FMT_RGB555X,
                .depth          = 16,
                .twformat       = ColorFormatRGB15 | ColorFormatBSWAP,
        }, {
                .name           = "16 bpp RGB, le",
                .fourcc         = V4L2_PIX_FMT_RGB565,
                .depth          = 16,
                .twformat       = ColorFormatRGB16,
        }, {
                .name           = "16 bpp RGB, be",
                .fourcc         = V4L2_PIX_FMT_RGB565X,
                .depth          = 16,
                .twformat       = ColorFormatRGB16 | ColorFormatBSWAP,
        }, {
                .name           = "24 bpp RGB, le",
                .fourcc         = V4L2_PIX_FMT_BGR24,
                .depth          = 24,
                .twformat       = ColorFormatRGB24,
        }, {
                .name           = "24 bpp RGB, be",
                .fourcc         = V4L2_PIX_FMT_RGB24,
                .depth          = 24,
                .twformat       = ColorFormatRGB24 | ColorFormatBSWAP,
        }, {
                .name           = "32 bpp RGB, le",
                .fourcc         = V4L2_PIX_FMT_BGR32,
                .depth          = 32,
                .twformat       = ColorFormatRGB32,
        }, {
                .name           = "32 bpp RGB, be",
                .fourcc         = V4L2_PIX_FMT_RGB32,
                .depth          = 32,
                .twformat       = ColorFormatRGB32 | ColorFormatBSWAP |
                                  ColorFormatWSWAP,
        }, {
                .name           = "4:2:2 packed, YUYV",
                .fourcc         = V4L2_PIX_FMT_YUYV,
                .depth          = 16,
                .twformat       = ColorFormatYUY2,
        }, {
                .name           = "4:2:2 packed, UYVY",
                .fourcc         = V4L2_PIX_FMT_UYVY,
                .depth          = 16,
                .twformat       = ColorFormatYUY2 | ColorFormatBSWAP,
        }
};
#define FORMATS ARRAY_SIZE(formats)

#define NORM_625_50                     \
                .h_delay        = 3,    \
                .h_delay0       = 133,  \
                .h_start        = 0,    \
                .h_stop         = 719,  \
                .v_delay        = 24,   \
                .vbi_v_start_0  = 7,    \
                .vbi_v_stop_0   = 22,   \
                .video_v_start  = 24,   \
                .video_v_stop   = 311,  \
                .vbi_v_start_1  = 319

#define NORM_525_60                     \
                .h_delay        = 8,    \
                .h_delay0       = 138,  \
                .h_start        = 0,    \
                .h_stop         = 719,  \
                .v_delay        = 22,   \
                .vbi_v_start_0  = 10,   \
                .vbi_v_stop_0   = 21,   \
                .video_v_start  = 22,   \
                .video_v_stop   = 262,  \
                .vbi_v_start_1  = 273

/*
 * The following table is searched by tw68_s_std, first for a specific
 * match, then for an entry which contains the desired id.  The table
 * entries should therefore be ordered in ascending order of specificity.
 */
static const struct tw68_tvnorm tvnorms[] = {
        {
                .name           = "PAL", /* autodetect */
                .id             = V4L2_STD_PAL,
                NORM_625_50,

                .sync_control   = 0x18,
                .luma_control   = 0x40,
                .chroma_ctrl1   = 0x81,
                .chroma_gain    = 0x2a,
                .chroma_ctrl2   = 0x06,
                .vgate_misc     = 0x1c,
                .format         = VideoFormatPALBDGHI,
        }, {
                .name           = "NTSC",
                .id             = V4L2_STD_NTSC,
                NORM_525_60,

                .sync_control   = 0x59,
                .luma_control   = 0x40,
                .chroma_ctrl1   = 0x89,
                .chroma_gain    = 0x2a,
                .chroma_ctrl2   = 0x0e,
                .vgate_misc     = 0x18,
                .format         = VideoFormatNTSC,
        }, {
                .name           = "SECAM",
                .id             = V4L2_STD_SECAM,
                NORM_625_50,

                .sync_control   = 0x18,
                .luma_control   = 0x1b,
                .chroma_ctrl1   = 0xd1,
                .chroma_gain    = 0x80,
                .chroma_ctrl2   = 0x00,
                .vgate_misc     = 0x1c,
                .format         = VideoFormatSECAM,
        }, {
                .name           = "PAL-M",
                .id             = V4L2_STD_PAL_M,
                NORM_525_60,

                .sync_control   = 0x59,
                .luma_control   = 0x40,
                .chroma_ctrl1   = 0xb9,
                .chroma_gain    = 0x2a,
                .chroma_ctrl2   = 0x0e,
                .vgate_misc     = 0x18,
                .format         = VideoFormatPALM,
        }, {
                .name           = "PAL-Nc",
                .id             = V4L2_STD_PAL_Nc,
                NORM_625_50,

                .sync_control   = 0x18,
                .luma_control   = 0x40,
                .chroma_ctrl1   = 0xa1,
                .chroma_gain    = 0x2a,
                .chroma_ctrl2   = 0x06,
                .vgate_misc     = 0x1c,
                .format         = VideoFormatPALNC,
        }, {
                .name           = "PAL-60",
                .id             = V4L2_STD_PAL_60,
                .h_delay        = 186,
                .h_start        = 0,
                .h_stop         = 719,
                .v_delay        = 26,
                .video_v_start  = 23,
                .video_v_stop   = 262,
                .vbi_v_start_0  = 10,
                .vbi_v_stop_0   = 21,
                .vbi_v_start_1  = 273,

                .sync_control   = 0x18,
                .luma_control   = 0x40,
                .chroma_ctrl1   = 0x81,
                .chroma_gain    = 0x2a,
                .chroma_ctrl2   = 0x06,
                .vgate_misc     = 0x1c,
                .format         = VideoFormatPAL60,
        }
};
#define TVNORMS ARRAY_SIZE(tvnorms)

static const struct tw68_format *format_by_fourcc(unsigned int fourcc)
{
        unsigned int i;

        for (i = 0; i < FORMATS; i++)
                if (formats[i].fourcc == fourcc)
                        return formats+i;
        return NULL;
}


/* ------------------------------------------------------------------ */
/*
 * Note that the cropping rectangles are described in terms of a single
 * frame, i.e. line positions are only 1/2 the interlaced equivalent
 */
static void set_tvnorm(struct tw68_dev *dev, const struct tw68_tvnorm *norm)
{
        if (norm != dev->tvnorm) {
                dev->width = 720;
                dev->height = (norm->id & V4L2_STD_525_60) ? 480 : 576;
                dev->tvnorm = norm;
                tw68_set_tvnorm_hw(dev);
        }
}

/*
 * tw68_set_scale
 *
 * Scaling and Cropping for video decoding
 *
 * We are working with 3 values for horizontal and vertical - scale,
 * delay and active.
 *
 * HACTIVE represent the actual number of pixels in the "usable" image,
 * before scaling.  HDELAY represents the number of pixels skipped
 * between the start of the horizontal sync and the start of the image.
 * HSCALE is calculated using the formula
 *      HSCALE = (HACTIVE / (#pixels desired)) * 256
 *
 * The vertical registers are similar, except based upon the total number
 * of lines in the image, and the first line of the image (i.e. ignoring
 * vertical sync and VBI).
 *
 * Note that the number of bytes reaching the FIFO (and hence needing
 * to be processed by the DMAP program) is completely dependent upon
 * these values, especially HSCALE.
 *
 * Parameters:
 *      @dev            pointer to the device structure, needed for
 *                      getting current norm (as well as debug print)
 *      @width          actual image width (from user buffer)
 *      @height         actual image height
 *      @field          indicates Top, Bottom or Interlaced
 */
static int tw68_set_scale(struct tw68_dev *dev, unsigned int width,
                          unsigned int height, enum v4l2_field field)
{
        const struct tw68_tvnorm *norm = dev->tvnorm;
        /* set individually for debugging clarity */
        int hactive, hdelay, hscale;
        int vactive, vdelay, vscale;
        int comb;

        if (V4L2_FIELD_HAS_BOTH(field)) /* if field is interlaced */
                height /= 2;            /* we must set for 1-frame */

        pr_debug("%s: width=%d, height=%d, both=%d\n"
                 "  tvnorm h_delay=%d, h_start=%d, h_stop=%d, v_delay=%d, v_start=%d, v_stop=%d\n",
                __func__, width, height, V4L2_FIELD_HAS_BOTH(field),
                norm->h_delay, norm->h_start, norm->h_stop,
                norm->v_delay, norm->video_v_start,
                norm->video_v_stop);

        switch (dev->vdecoder) {
        case TW6800:
                hdelay = norm->h_delay0;
                break;
        default:
                hdelay = norm->h_delay;
                break;
        }

        hdelay += norm->h_start;
        hactive = norm->h_stop - norm->h_start + 1;

        hscale = (hactive * 256) / (width);

        vdelay = norm->v_delay;
        vactive = ((norm->id & V4L2_STD_525_60) ? 524 : 624) / 2 - norm->video_v_start;
        vscale = (vactive * 256) / height;

        pr_debug("%s: %dx%d [%s%s,%s]\n", __func__,
                width, height,
                V4L2_FIELD_HAS_TOP(field)    ? "T" : "",
                V4L2_FIELD_HAS_BOTTOM(field) ? "B" : "",
                v4l2_norm_to_name(dev->tvnorm->id));
        pr_debug("%s: hactive=%d, hdelay=%d, hscale=%d; vactive=%d, vdelay=%d, vscale=%d\n",
                 __func__,
                hactive, hdelay, hscale, vactive, vdelay, vscale);

        comb =  ((vdelay & 0x300)  >> 2) |
                ((vactive & 0x300) >> 4) |
                ((hdelay & 0x300)  >> 6) |
                ((hactive & 0x300) >> 8);
        pr_debug("%s: setting CROP_HI=%02x, VDELAY_LO=%02x, VACTIVE_LO=%02x, HDELAY_LO=%02x, HACTIVE_LO=%02x\n",
                __func__, comb, vdelay, vactive, hdelay, hactive);
        tw_writeb(TW68_CROP_HI, comb);
        tw_writeb(TW68_VDELAY_LO, vdelay & 0xff);
        tw_writeb(TW68_VACTIVE_LO, vactive & 0xff);
        tw_writeb(TW68_HDELAY_LO, hdelay & 0xff);
        tw_writeb(TW68_HACTIVE_LO, hactive & 0xff);

        comb = ((vscale & 0xf00) >> 4) | ((hscale & 0xf00) >> 8);
        pr_debug("%s: setting SCALE_HI=%02x, VSCALE_LO=%02x, HSCALE_LO=%02x\n",
                 __func__, comb, vscale, hscale);
        tw_writeb(TW68_SCALE_HI, comb);
        tw_writeb(TW68_VSCALE_LO, vscale);
        tw_writeb(TW68_HSCALE_LO, hscale);

        return 0;
}

/* ------------------------------------------------------------------ */

int tw68_video_start_dma(struct tw68_dev *dev, struct tw68_buf *buf)
{
        /* Set cropping and scaling */
        tw68_set_scale(dev, dev->width, dev->height, dev->field);
        /*
         *  Set start address for RISC program.  Note that if the DMAP
         *  processor is currently running, it must be stopped before
         *  a new address can be set.
         */
        tw_clearl(TW68_DMAC, TW68_DMAP_EN);
        tw_writel(TW68_DMAP_SA, buf->dma);
        /* Clear any pending interrupts */
        tw_writel(TW68_INTSTAT, dev->board_virqmask);
        /* Enable the risc engine and the fifo */
        tw_andorl(TW68_DMAC, 0xff, dev->fmt->twformat |
                ColorFormatGamma | TW68_DMAP_EN | TW68_FIFO_EN);
        dev->pci_irqmask |= dev->board_virqmask;
        tw_setl(TW68_INTMASK, dev->pci_irqmask);
        return 0;
}

/* ------------------------------------------------------------------ */

/* calc max # of buffers from size (must not exceed the 4MB virtual
 * address space per DMA channel) */
static int tw68_buffer_count(unsigned int size, unsigned int count)
{
        unsigned int maxcount;

        maxcount = (4 * 1024 * 1024) / roundup(size, PAGE_SIZE);
        if (count > maxcount)
                count = maxcount;
        return count;
}

/* ------------------------------------------------------------- */
/* vb2 queue operations                                          */

static int tw68_queue_setup(struct vb2_queue *q,
                           unsigned int *num_buffers, unsigned int *num_planes,
                           unsigned int sizes[], struct device *alloc_devs[])
{
        struct tw68_dev *dev = vb2_get_drv_priv(q);
        unsigned tot_bufs = q->num_buffers + *num_buffers;
        unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;

        if (tot_bufs < 2)
                tot_bufs = 2;
        tot_bufs = tw68_buffer_count(size, tot_bufs);
        *num_buffers = tot_bufs - q->num_buffers;
        /*
         * We allow create_bufs, but only if the sizeimage is >= as the
         * current sizeimage. The tw68_buffer_count calculation becomes quite
         * difficult otherwise.
         */
        if (*num_planes)
                return sizes[0] < size ? -EINVAL : 0;
        *num_planes = 1;
        sizes[0] = size;

        return 0;
}

/*
 * The risc program for each buffers works as follows: it starts with a simple
 * 'JUMP to addr + 8', which is effectively a NOP. Then the program to DMA the
 * buffer follows and at the end we have a JUMP back to the start + 8 (skipping
 * the initial JUMP).
 *
 * This is the program of the first buffer to be queued if the active list is
 * empty and it just keeps DMAing this buffer without generating any interrupts.
 *
 * If a new buffer is added then the initial JUMP in the program generates an
 * interrupt as well which signals that the previous buffer has been DMAed
 * successfully and that it can be returned to userspace.
 *
 * It also sets the final jump of the previous buffer to the start of the new
 * buffer, thus chaining the new buffer into the DMA chain. This is a single
 * atomic u32 write, so there is no race condition.
 *
 * The end-result of all this that you only get an interrupt when a buffer
 * is ready, so the control flow is very easy.
 */
static void tw68_buf_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vb2_queue *vq = vb->vb2_queue;
        struct tw68_dev *dev = vb2_get_drv_priv(vq);
        struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
        struct tw68_buf *prev;
        unsigned long flags;

        spin_lock_irqsave(&dev->slock, flags);

        /* append a 'JUMP to start of buffer' to the buffer risc program */
        buf->jmp[0] = cpu_to_le32(RISC_JUMP);
        buf->jmp[1] = cpu_to_le32(buf->dma + 8);

        if (!list_empty(&dev->active)) {
                prev = list_entry(dev->active.prev, struct tw68_buf, list);
                buf->cpu[0] |= cpu_to_le32(RISC_INT_BIT);
                prev->jmp[1] = cpu_to_le32(buf->dma);
        }
        list_add_tail(&buf->list, &dev->active);
        spin_unlock_irqrestore(&dev->slock, flags);
}

/*
 * buffer_prepare
 *
 * Set the ancilliary information into the buffer structure.  This
 * includes generating the necessary risc program if it hasn't already
 * been done for the current buffer format.
 * The structure fh contains the details of the format requested by the
 * user - type, width, height and #fields.  This is compared with the
 * last format set for the current buffer.  If they differ, the risc
 * code (which controls the filling of the buffer) is (re-)generated.
 */
static int tw68_buf_prepare(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vb2_queue *vq = vb->vb2_queue;
        struct tw68_dev *dev = vb2_get_drv_priv(vq);
        struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);
        struct sg_table *dma = vb2_dma_sg_plane_desc(vb, 0);
        unsigned size, bpl;

        size = (dev->width * dev->height * dev->fmt->depth) >> 3;
        if (vb2_plane_size(vb, 0) < size)
                return -EINVAL;
        vb2_set_plane_payload(vb, 0, size);

        bpl = (dev->width * dev->fmt->depth) >> 3;
        switch (dev->field) {
        case V4L2_FIELD_TOP:
                tw68_risc_buffer(dev->pci, buf, dma->sgl,
                                 0, UNSET, bpl, 0, dev->height);
                break;
        case V4L2_FIELD_BOTTOM:
                tw68_risc_buffer(dev->pci, buf, dma->sgl,
                                 UNSET, 0, bpl, 0, dev->height);
                break;
        case V4L2_FIELD_SEQ_TB:
                tw68_risc_buffer(dev->pci, buf, dma->sgl,
                                 0, bpl * (dev->height >> 1),
                                 bpl, 0, dev->height >> 1);
                break;
        case V4L2_FIELD_SEQ_BT:
                tw68_risc_buffer(dev->pci, buf, dma->sgl,
                                 bpl * (dev->height >> 1), 0,
                                 bpl, 0, dev->height >> 1);
                break;
        case V4L2_FIELD_INTERLACED:
        default:
                tw68_risc_buffer(dev->pci, buf, dma->sgl,
                                 0, bpl, bpl, bpl, dev->height >> 1);
                break;
        }
        return 0;
}

static void tw68_buf_finish(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct vb2_queue *vq = vb->vb2_queue;
        struct tw68_dev *dev = vb2_get_drv_priv(vq);
        struct tw68_buf *buf = container_of(vbuf, struct tw68_buf, vb);

        pci_free_consistent(dev->pci, buf->size, buf->cpu, buf->dma);
}

static int tw68_start_streaming(struct vb2_queue *q, unsigned int count)
{
        struct tw68_dev *dev = vb2_get_drv_priv(q);
        struct tw68_buf *buf =
                container_of(dev->active.next, struct tw68_buf, list);

        dev->seqnr = 0;
        tw68_video_start_dma(dev, buf);
        return 0;
}

static void tw68_stop_streaming(struct vb2_queue *q)
{
        struct tw68_dev *dev = vb2_get_drv_priv(q);

        /* Stop risc & fifo */
        tw_clearl(TW68_DMAC, TW68_DMAP_EN | TW68_FIFO_EN);
        while (!list_empty(&dev->active)) {
                struct tw68_buf *buf =
                        container_of(dev->active.next, struct tw68_buf, list);

                list_del(&buf->list);
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
        }
}

static const struct vb2_ops tw68_video_qops = {
        .queue_setup    = tw68_queue_setup,
        .buf_queue      = tw68_buf_queue,
        .buf_prepare    = tw68_buf_prepare,
        .buf_finish     = tw68_buf_finish,
        .start_streaming = tw68_start_streaming,
        .stop_streaming = tw68_stop_streaming,
        .wait_prepare   = vb2_ops_wait_prepare,
        .wait_finish    = vb2_ops_wait_finish,
};

/* ------------------------------------------------------------------ */

static int tw68_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct tw68_dev *dev =
                container_of(ctrl->handler, struct tw68_dev, hdl);

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                tw_writeb(TW68_BRIGHT, ctrl->val);
                break;
        case V4L2_CID_HUE:
                tw_writeb(TW68_HUE, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                tw_writeb(TW68_CONTRAST, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                tw_writeb(TW68_SAT_U, ctrl->val);
                tw_writeb(TW68_SAT_V, ctrl->val);
                break;
        case V4L2_CID_COLOR_KILLER:
                if (ctrl->val)
                        tw_andorb(TW68_MISC2, 0xe0, 0xe0);
                else
                        tw_andorb(TW68_MISC2, 0xe0, 0x00);
                break;
        case V4L2_CID_CHROMA_AGC:
                if (ctrl->val)
                        tw_andorb(TW68_LOOP, 0x30, 0x20);
                else
                        tw_andorb(TW68_LOOP, 0x30, 0x00);
                break;
        }
        return 0;
}

/* ------------------------------------------------------------------ */

/*
 * Note that this routine returns what is stored in the fh structure, and
 * does not interrogate any of the device registers.
 */
static int tw68_g_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *f)
{
        struct tw68_dev *dev = video_drvdata(file);

        f->fmt.pix.width        = dev->width;
        f->fmt.pix.height       = dev->height;
        f->fmt.pix.field        = dev->field;
        f->fmt.pix.pixelformat  = dev->fmt->fourcc;
        f->fmt.pix.bytesperline =
                (f->fmt.pix.width * (dev->fmt->depth)) >> 3;
        f->fmt.pix.sizeimage =
                f->fmt.pix.height * f->fmt.pix.bytesperline;
        f->fmt.pix.colorspace   = V4L2_COLORSPACE_SMPTE170M;
        f->fmt.pix.priv = 0;
        return 0;
}

static int tw68_try_fmt_vid_cap(struct file *file, void *priv,
                                                struct v4l2_format *f)
{
        struct tw68_dev *dev = video_drvdata(file);
        const struct tw68_format *fmt;
        enum v4l2_field field;
        unsigned int maxh;

        fmt = format_by_fourcc(f->fmt.pix.pixelformat);
        if (NULL == fmt)
                return -EINVAL;

        field = f->fmt.pix.field;
        maxh  = (dev->tvnorm->id & V4L2_STD_525_60) ? 480 : 576;

        switch (field) {
        case V4L2_FIELD_TOP:
        case V4L2_FIELD_BOTTOM:
                break;
        case V4L2_FIELD_INTERLACED:
        case V4L2_FIELD_SEQ_BT:
        case V4L2_FIELD_SEQ_TB:
                maxh = maxh * 2;
                break;
        default:
                field = (f->fmt.pix.height > maxh / 2)
                        ? V4L2_FIELD_INTERLACED
                        : V4L2_FIELD_BOTTOM;
                break;
        }

        f->fmt.pix.field = field;
        if (f->fmt.pix.width  < 48)
                f->fmt.pix.width  = 48;
        if (f->fmt.pix.height < 32)
                f->fmt.pix.height = 32;
        if (f->fmt.pix.width > 720)
                f->fmt.pix.width = 720;
        if (f->fmt.pix.height > maxh)
                f->fmt.pix.height = maxh;
        f->fmt.pix.width &= ~0x03;
        f->fmt.pix.bytesperline =
                (f->fmt.pix.width * (fmt->depth)) >> 3;
        f->fmt.pix.sizeimage =
                f->fmt.pix.height * f->fmt.pix.bytesperline;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
        return 0;
}

/*
 * Note that tw68_s_fmt_vid_cap sets the information into the fh structure,
 * and it will be used for all future new buffers.  However, there could be
 * some number of buffers on the "active" chain which will be filled before
 * the change takes place.
 */
static int tw68_s_fmt_vid_cap(struct file *file, void *priv,
                                        struct v4l2_format *f)
{
        struct tw68_dev *dev = video_drvdata(file);
        int err;

        err = tw68_try_fmt_vid_cap(file, priv, f);
        if (0 != err)
                return err;

        dev->fmt = format_by_fourcc(f->fmt.pix.pixelformat);
        dev->width = f->fmt.pix.width;
        dev->height = f->fmt.pix.height;
        dev->field = f->fmt.pix.field;
        return 0;
}

static int tw68_enum_input(struct file *file, void *priv,
                                        struct v4l2_input *i)
{
        struct tw68_dev *dev = video_drvdata(file);
        unsigned int n;

        n = i->index;
        if (n >= TW68_INPUT_MAX)
                return -EINVAL;
        i->index = n;
        i->type = V4L2_INPUT_TYPE_CAMERA;
        snprintf(i->name, sizeof(i->name), "Composite %d", n);

        /* If the query is for the current input, get live data */
        if (n == dev->input) {
                int v1 = tw_readb(TW68_STATUS1);
                int v2 = tw_readb(TW68_MVSN);

                if (0 != (v1 & (1 << 7)))
                        i->status |= V4L2_IN_ST_NO_SYNC;
                if (0 != (v1 & (1 << 6)))
                        i->status |= V4L2_IN_ST_NO_H_LOCK;
                if (0 != (v1 & (1 << 2)))
                        i->status |= V4L2_IN_ST_NO_SIGNAL;
                if (0 != (v1 & 1 << 1))
                        i->status |= V4L2_IN_ST_NO_COLOR;
                if (0 != (v2 & (1 << 2)))
                        i->status |= V4L2_IN_ST_MACROVISION;
        }
        i->std = video_devdata(file)->tvnorms;
        return 0;
}

static int tw68_g_input(struct file *file, void *priv, unsigned int *i)
{
        struct tw68_dev *dev = video_drvdata(file);

        *i = dev->input;
        return 0;
}

static int tw68_s_input(struct file *file, void *priv, unsigned int i)
{
        struct tw68_dev *dev = video_drvdata(file);

        if (i >= TW68_INPUT_MAX)
                return -EINVAL;
        dev->input = i;
        tw_andorb(TW68_INFORM, 0x03 << 2, dev->input << 2);
        return 0;
}

static int tw68_querycap(struct file *file, void  *priv,
                                        struct v4l2_capability *cap)
{
        struct tw68_dev *dev = video_drvdata(file);

        strcpy(cap->driver, "tw68");
        strlcpy(cap->card, "Techwell Capture Card",
                sizeof(cap->card));
        sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
        cap->device_caps =
                V4L2_CAP_VIDEO_CAPTURE |
                V4L2_CAP_READWRITE |
                V4L2_CAP_STREAMING;

        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
        return 0;
}

static int tw68_s_std(struct file *file, void *priv, v4l2_std_id id)
{
        struct tw68_dev *dev = video_drvdata(file);
        unsigned int i;

        if (vb2_is_busy(&dev->vidq))
                return -EBUSY;

        /* Look for match on complete norm id (may have mult bits) */
        for (i = 0; i < TVNORMS; i++) {
                if (id == tvnorms[i].id)
                        break;
        }

        /* If no exact match, look for norm which contains this one */
        if (i == TVNORMS) {
                for (i = 0; i < TVNORMS; i++)
                        if (id & tvnorms[i].id)
                                break;
        }
        /* If still not matched, give up */
        if (i == TVNORMS)
                return -EINVAL;

        set_tvnorm(dev, &tvnorms[i]);   /* do the actual setting */
        return 0;
}

static int tw68_g_std(struct file *file, void *priv, v4l2_std_id *id)
{
        struct tw68_dev *dev = video_drvdata(file);

        *id = dev->tvnorm->id;
        return 0;
}

static int tw68_enum_fmt_vid_cap(struct file *file, void  *priv,
                                        struct v4l2_fmtdesc *f)
{
        if (f->index >= FORMATS)
                return -EINVAL;

        strlcpy(f->description, formats[f->index].name,
                sizeof(f->description));

        f->pixelformat = formats[f->index].fourcc;

        return 0;
}

/*
 * Used strictly for internal development and debugging, this routine
 * prints out the current register contents for the tw68xx device.
 */
static void tw68_dump_regs(struct tw68_dev *dev)
{
        unsigned char line[80];
        int i, j, k;
        unsigned char *cptr;

        pr_info("Full dump of TW68 registers:\n");
        /* First we do the PCI regs, 8 4-byte regs per line */
        for (i = 0; i < 0x100; i += 32) {
                cptr = line;
                cptr += sprintf(cptr, "%03x  ", i);
                /* j steps through the next 4 words */
                for (j = i; j < i + 16; j += 4)
                        cptr += sprintf(cptr, "%08x ", tw_readl(j));
                *cptr++ = ' ';
                for (; j < i + 32; j += 4)
                        cptr += sprintf(cptr, "%08x ", tw_readl(j));
                *cptr++ = '\n';
                *cptr = 0;
                pr_info("%s", line);
        }
        /* Next the control regs, which are single-byte, address mod 4 */
        while (i < 0x400) {
                cptr = line;
                cptr += sprintf(cptr, "%03x ", i);
                /* Print out 4 groups of 4 bytes */
                for (j = 0; j < 4; j++) {
                        for (k = 0; k < 4; k++) {
                                cptr += sprintf(cptr, "%02x ",
                                        tw_readb(i));
                                i += 4;
                        }
                        *cptr++ = ' ';
                }
                *cptr++ = '\n';
                *cptr = 0;
                pr_info("%s", line);
        }
}

static int vidioc_log_status(struct file *file, void *priv)
{
        struct tw68_dev *dev = video_drvdata(file);

        tw68_dump_regs(dev);
        return v4l2_ctrl_log_status(file, priv);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_register(struct file *file, void *priv,
                              struct v4l2_dbg_register *reg)
{
        struct tw68_dev *dev = video_drvdata(file);

        if (reg->size == 1)
                reg->val = tw_readb(reg->reg);
        else
                reg->val = tw_readl(reg->reg);
        return 0;
}

static int vidioc_s_register(struct file *file, void *priv,
                                const struct v4l2_dbg_register *reg)
{
        struct tw68_dev *dev = video_drvdata(file);

        if (reg->size == 1)
                tw_writeb(reg->reg, reg->val);
        else
                tw_writel(reg->reg & 0xffff, reg->val);
        return 0;
}
#endif

static const struct v4l2_ctrl_ops tw68_ctrl_ops = {
        .s_ctrl = tw68_s_ctrl,
};

static const struct v4l2_file_operations video_fops = {
        .owner                  = THIS_MODULE,
        .open                   = v4l2_fh_open,
        .release                = vb2_fop_release,
        .read                   = vb2_fop_read,
        .poll                   = vb2_fop_poll,
        .mmap                   = vb2_fop_mmap,
        .unlocked_ioctl         = video_ioctl2,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
        .vidioc_querycap                = tw68_querycap,
        .vidioc_enum_fmt_vid_cap        = tw68_enum_fmt_vid_cap,
        .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_s_std                   = tw68_s_std,
        .vidioc_g_std                   = tw68_g_std,
        .vidioc_enum_input              = tw68_enum_input,
        .vidioc_g_input                 = tw68_g_input,
        .vidioc_s_input                 = tw68_s_input,
        .vidioc_streamon                = vb2_ioctl_streamon,
        .vidioc_streamoff               = vb2_ioctl_streamoff,
        .vidioc_g_fmt_vid_cap           = tw68_g_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap         = tw68_try_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap           = tw68_s_fmt_vid_cap,
        .vidioc_log_status              = vidioc_log_status,
        .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .vidioc_g_register              = vidioc_g_register,
        .vidioc_s_register              = vidioc_s_register,
#endif
};

static const struct video_device tw68_video_template = {
        .name                   = "tw68_video",
        .fops                   = &video_fops,
        .ioctl_ops              = &video_ioctl_ops,
        .release                = video_device_release_empty,
        .tvnorms                = TW68_NORMS,
};

/* ------------------------------------------------------------------ */
/* exported stuff                                                     */
void tw68_set_tvnorm_hw(struct tw68_dev *dev)
{
        tw_andorb(TW68_SDT, 0x07, dev->tvnorm->format);
}

int tw68_video_init1(struct tw68_dev *dev)
{
        struct v4l2_ctrl_handler *hdl = &dev->hdl;

        v4l2_ctrl_handler_init(hdl, 6);
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, -128, 127, 1, 20);
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_CONTRAST, 0, 255, 1, 100);
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_SATURATION, 0, 255, 1, 128);
        /* NTSC only */
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_HUE, -128, 127, 1, 0);
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
        v4l2_ctrl_new_std(hdl, &tw68_ctrl_ops,
                        V4L2_CID_CHROMA_AGC, 0, 1, 1, 1);
        if (hdl->error) {
                v4l2_ctrl_handler_free(hdl);
                return hdl->error;
        }
        dev->v4l2_dev.ctrl_handler = hdl;
        v4l2_ctrl_handler_setup(hdl);
        return 0;
}

int tw68_video_init2(struct tw68_dev *dev, int video_nr)
{
        int ret;

        set_tvnorm(dev, &tvnorms[0]);

        dev->fmt      = format_by_fourcc(V4L2_PIX_FMT_BGR24);
        dev->width    = 720;
        dev->height   = 576;
        dev->field    = V4L2_FIELD_INTERLACED;

        INIT_LIST_HEAD(&dev->active);
        dev->vidq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        dev->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        dev->vidq.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ | VB2_DMABUF;
        dev->vidq.ops = &tw68_video_qops;
        dev->vidq.mem_ops = &vb2_dma_sg_memops;
        dev->vidq.drv_priv = dev;
        dev->vidq.gfp_flags = __GFP_DMA32 | __GFP_KSWAPD_RECLAIM;
        dev->vidq.buf_struct_size = sizeof(struct tw68_buf);
        dev->vidq.lock = &dev->lock;
        dev->vidq.min_buffers_needed = 2;
        dev->vidq.dev = &dev->pci->dev;
        ret = vb2_queue_init(&dev->vidq);
        if (ret)
                return ret;
        dev->vdev = tw68_video_template;
        dev->vdev.v4l2_dev = &dev->v4l2_dev;
        dev->vdev.lock = &dev->lock;
        dev->vdev.queue = &dev->vidq;
        video_set_drvdata(&dev->vdev, dev);
        return video_register_device(&dev->vdev, VFL_TYPE_GRABBER, video_nr);
}

/*
 * tw68_irq_video_done
 */
void tw68_irq_video_done(struct tw68_dev *dev, unsigned long status)
{
        __u32 reg;

        /* reset interrupts handled by this routine */
        tw_writel(TW68_INTSTAT, status);
        /*
         * Check most likely first
         *
         * DMAPI shows we have reached the end of the risc code
         * for the current buffer.
         */
        if (status & TW68_DMAPI) {
                struct tw68_buf *buf;

                spin_lock(&dev->slock);
                buf = list_entry(dev->active.next, struct tw68_buf, list);
                list_del(&buf->list);
                spin_unlock(&dev->slock);
                buf->vb.vb2_buf.timestamp = ktime_get_ns();
                buf->vb.field = dev->field;
                buf->vb.sequence = dev->seqnr++;
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
                status &= ~(TW68_DMAPI);
                if (0 == status)
                        return;
        }
        if (status & (TW68_VLOCK | TW68_HLOCK))
                dev_dbg(&dev->pci->dev, "Lost sync\n");
        if (status & TW68_PABORT)
                dev_err(&dev->pci->dev, "PABORT interrupt\n");
        if (status & TW68_DMAPERR)
                dev_err(&dev->pci->dev, "DMAPERR interrupt\n");
        /*
         * On TW6800, FDMIS is apparently generated if video input is switched
         * during operation.  Therefore, it is not enabled for that chip.
         */
        if (status & TW68_FDMIS)
                dev_dbg(&dev->pci->dev, "FDMIS interrupt\n");
        if (status & TW68_FFOF) {
                /* probably a logic error */
                reg = tw_readl(TW68_DMAC) & TW68_FIFO_EN;
                tw_clearl(TW68_DMAC, TW68_FIFO_EN);
                dev_dbg(&dev->pci->dev, "FFOF interrupt\n");
                tw_setl(TW68_DMAC, reg);
        }
        if (status & TW68_FFERR)
                dev_dbg(&dev->pci->dev, "FFERR interrupt\n");
}