/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
 *  Based on Steven Toth <stoth@linuxtv.org> cx25821 driver
 *  Parts adapted/taken from Eduardo Moscoso Rubino
 *  Copyright (C) 2009 Eduardo Moscoso Rubino <moscoso@TopoLogica.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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "cx25821-video.h"

MODULE_DESCRIPTION("v4l2 driver module for cx25821 based TV cards");
MODULE_AUTHOR("Hiep Huynh <hiep.huynh@conexant.com>");
MODULE_LICENSE("GPL");

static unsigned int video_nr[] = {[0 ... (CX25821_MAXBOARDS - 1)] = UNSET };

module_param_array(video_nr, int, NULL, 0444);

MODULE_PARM_DESC(video_nr, "video device numbers");

static unsigned int video_debug = VIDEO_DEBUG;
module_param(video_debug, int, 0644);
MODULE_PARM_DESC(video_debug, "enable debug messages [video]");

static unsigned int irq_debug;
module_param(irq_debug, int, 0644);
MODULE_PARM_DESC(irq_debug, "enable debug messages [IRQ handler]");

#define FORMAT_FLAGS_PACKED       0x01

static const struct cx25821_fmt formats[] = {
        {
                .name = "4:1:1, packed, Y41P",
                .fourcc = V4L2_PIX_FMT_Y41P,
                .depth = 12,
                .flags = FORMAT_FLAGS_PACKED,
        }, {
                .name = "4:2:2, packed, YUYV",
                .fourcc = V4L2_PIX_FMT_YUYV,
                .depth = 16,
                .flags = FORMAT_FLAGS_PACKED,
        },
};

static const struct cx25821_fmt *cx25821_format_by_fourcc(unsigned int fourcc)
{
        unsigned int i;

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

int cx25821_start_video_dma(struct cx25821_dev *dev,
                            struct cx25821_dmaqueue *q,
                            struct cx25821_buffer *buf,
                            const struct sram_channel *channel)
{
        int tmp = 0;

        /* setup fifo + format */
        cx25821_sram_channel_setup(dev, channel, buf->bpl, buf->risc.dma);

        /* reset counter */
        cx_write(channel->gpcnt_ctl, 3);

        /* enable irq */
        cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | (1 << channel->i));
        cx_set(channel->int_msk, 0x11);

        /* start dma */
        cx_write(channel->dma_ctl, 0x11);       /* FIFO and RISC enable */

        /* make sure upstream setting if any is reversed */
        tmp = cx_read(VID_CH_MODE_SEL);
        cx_write(VID_CH_MODE_SEL, tmp & 0xFFFFFE00);

        return 0;
}

int cx25821_video_irq(struct cx25821_dev *dev, int chan_num, u32 status)
{
        int handled = 0;
        u32 mask;
        const struct sram_channel *channel = dev->channels[chan_num].sram_channels;

        mask = cx_read(channel->int_msk);
        if (0 == (status & mask))
                return handled;

        cx_write(channel->int_stat, status);

        /* risc op code error */
        if (status & (1 << 16)) {
                pr_warn("%s, %s: video risc op code error\n",
                        dev->name, channel->name);
                cx_clear(channel->dma_ctl, 0x11);
                cx25821_sram_channel_dump(dev, channel);
        }

        /* risc1 y */
        if (status & FLD_VID_DST_RISC1) {
                struct cx25821_dmaqueue *dmaq =
                        &dev->channels[channel->i].dma_vidq;
                struct cx25821_buffer *buf;

                spin_lock(&dev->slock);
                if (!list_empty(&dmaq->active)) {
                        buf = list_entry(dmaq->active.next,
                                         struct cx25821_buffer, queue);

                        buf->vb.vb2_buf.timestamp = ktime_get_ns();
                        buf->vb.sequence = dmaq->count++;
                        list_del(&buf->queue);
                        vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
                }
                spin_unlock(&dev->slock);
                handled++;
        }
        return handled;
}

static int cx25821_queue_setup(struct vb2_queue *q,
                           unsigned int *num_buffers, unsigned int *num_planes,
                           unsigned int sizes[], struct device *alloc_devs[])
{
        struct cx25821_channel *chan = q->drv_priv;
        unsigned size = (chan->fmt->depth * chan->width * chan->height) >> 3;

        if (*num_planes)
                return sizes[0] < size ? -EINVAL : 0;

        *num_planes = 1;
        sizes[0] = size;
        return 0;
}

static int cx25821_buffer_prepare(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
        struct cx25821_dev *dev = chan->dev;
        struct cx25821_buffer *buf =
                container_of(vbuf, struct cx25821_buffer, vb);
        struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
        u32 line0_offset;
        int bpl_local = LINE_SIZE_D1;
        int ret;

        if (chan->pixel_formats == PIXEL_FRMT_411)
                buf->bpl = (chan->fmt->depth * chan->width) >> 3;
        else
                buf->bpl = (chan->fmt->depth >> 3) * chan->width;

        if (vb2_plane_size(vb, 0) < chan->height * buf->bpl)
                return -EINVAL;
        vb2_set_plane_payload(vb, 0, chan->height * buf->bpl);
        buf->vb.field = chan->field;

        if (chan->pixel_formats == PIXEL_FRMT_411) {
                bpl_local = buf->bpl;
        } else {
                bpl_local = buf->bpl;   /* Default */

                if (chan->use_cif_resolution) {
                        if (dev->tvnorm & V4L2_STD_625_50)
                                bpl_local = 352 << 1;
                        else
                                bpl_local = chan->cif_width << 1;
                }
        }

        switch (chan->field) {
        case V4L2_FIELD_TOP:
                ret = cx25821_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, 0, UNSET,
                                buf->bpl, 0, chan->height);
                break;
        case V4L2_FIELD_BOTTOM:
                ret = cx25821_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, UNSET, 0,
                                buf->bpl, 0, chan->height);
                break;
        case V4L2_FIELD_INTERLACED:
                /* All other formats are top field first */
                line0_offset = 0;
                dprintk(1, "top field first\n");

                ret = cx25821_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl, line0_offset,
                                bpl_local, bpl_local, bpl_local,
                                chan->height >> 1);
                break;
        case V4L2_FIELD_SEQ_TB:
                ret = cx25821_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl,
                                0, buf->bpl * (chan->height >> 1),
                                buf->bpl, 0, chan->height >> 1);
                break;
        case V4L2_FIELD_SEQ_BT:
                ret = cx25821_risc_buffer(dev->pci, &buf->risc,
                                sgt->sgl,
                                buf->bpl * (chan->height >> 1), 0,
                                buf->bpl, 0, chan->height >> 1);
                break;
        default:
                WARN_ON(1);
                ret = -EINVAL;
                break;
        }

        dprintk(2, "[%p/%d] buffer_prep - %dx%d %dbpp \"%s\" - dma=0x%08lx\n",
                buf, buf->vb.vb2_buf.index, chan->width, chan->height,
                chan->fmt->depth, chan->fmt->name,
                (unsigned long)buf->risc.dma);

        return ret;
}

static void cx25821_buffer_finish(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx25821_buffer *buf =
                container_of(vbuf, struct cx25821_buffer, vb);
        struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
        struct cx25821_dev *dev = chan->dev;

        cx25821_free_buffer(dev, buf);
}

static void cx25821_buffer_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct cx25821_buffer *buf =
                container_of(vbuf, struct cx25821_buffer, vb);
        struct cx25821_channel *chan = vb->vb2_queue->drv_priv;
        struct cx25821_dev *dev = chan->dev;
        struct cx25821_buffer *prev;
        struct cx25821_dmaqueue *q = &dev->channels[chan->id].dma_vidq;

        buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 12);
        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 12);
        buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */

        if (list_empty(&q->active)) {
                list_add_tail(&buf->queue, &q->active);
        } else {
                buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
                prev = list_entry(q->active.prev, struct cx25821_buffer,
                                queue);
                list_add_tail(&buf->queue, &q->active);
                prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
        }
}

static int cx25821_start_streaming(struct vb2_queue *q, unsigned int count)
{
        struct cx25821_channel *chan = q->drv_priv;
        struct cx25821_dev *dev = chan->dev;
        struct cx25821_dmaqueue *dmaq = &dev->channels[chan->id].dma_vidq;
        struct cx25821_buffer *buf = list_entry(dmaq->active.next,
                        struct cx25821_buffer, queue);

        dmaq->count = 0;
        cx25821_start_video_dma(dev, dmaq, buf, chan->sram_channels);
        return 0;
}

static void cx25821_stop_streaming(struct vb2_queue *q)
{
        struct cx25821_channel *chan = q->drv_priv;
        struct cx25821_dev *dev = chan->dev;
        struct cx25821_dmaqueue *dmaq = &dev->channels[chan->id].dma_vidq;
        unsigned long flags;

        cx_write(chan->sram_channels->dma_ctl, 0); /* FIFO and RISC disable */
        spin_lock_irqsave(&dev->slock, flags);
        while (!list_empty(&dmaq->active)) {
                struct cx25821_buffer *buf = list_entry(dmaq->active.next,
                        struct cx25821_buffer, queue);

                list_del(&buf->queue);
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&dev->slock, flags);
}

static const struct vb2_ops cx25821_video_qops = {
        .queue_setup    = cx25821_queue_setup,
        .buf_prepare  = cx25821_buffer_prepare,
        .buf_finish = cx25821_buffer_finish,
        .buf_queue    = cx25821_buffer_queue,
        .wait_prepare = vb2_ops_wait_prepare,
        .wait_finish = vb2_ops_wait_finish,
        .start_streaming = cx25821_start_streaming,
        .stop_streaming = cx25821_stop_streaming,
};

/* VIDEO IOCTLS */

static int cx25821_vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
                            struct v4l2_fmtdesc *f)
{
        if (unlikely(f->index >= ARRAY_SIZE(formats)))
                return -EINVAL;

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

        return 0;
}

static int cx25821_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
                                 struct v4l2_format *f)
{
        struct cx25821_channel *chan = video_drvdata(file);

        f->fmt.pix.width = chan->width;
        f->fmt.pix.height = chan->height;
        f->fmt.pix.field = chan->field;
        f->fmt.pix.pixelformat = chan->fmt->fourcc;
        f->fmt.pix.bytesperline = (chan->width * chan->fmt->depth) >> 3;
        f->fmt.pix.sizeimage = chan->height * f->fmt.pix.bytesperline;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

        return 0;
}

static int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                                   struct v4l2_format *f)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;
        const struct cx25821_fmt *fmt;
        enum v4l2_field field = f->fmt.pix.field;
        unsigned int maxh;
        unsigned w;

        fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
        if (NULL == fmt)
                return -EINVAL;
        maxh = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;

        w = f->fmt.pix.width;
        if (field != V4L2_FIELD_BOTTOM)
                field = V4L2_FIELD_TOP;
        if (w < 352) {
                w = 176;
                f->fmt.pix.height = maxh / 4;
        } else if (w < 720) {
                w = 352;
                f->fmt.pix.height = maxh / 2;
        } else {
                w = 720;
                f->fmt.pix.height = maxh;
                field = V4L2_FIELD_INTERLACED;
        }
        f->fmt.pix.field = field;
        f->fmt.pix.width = w;
        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;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *f)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;
        int pix_format = PIXEL_FRMT_422;
        int err;

        err = cx25821_vidioc_try_fmt_vid_cap(file, priv, f);

        if (0 != err)
                return err;

        chan->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
        chan->field = f->fmt.pix.field;
        chan->width = f->fmt.pix.width;
        chan->height = f->fmt.pix.height;

        if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
                pix_format = PIXEL_FRMT_411;
        else
                pix_format = PIXEL_FRMT_422;

        cx25821_set_pixel_format(dev, SRAM_CH00, pix_format);

        /* check if cif resolution */
        if (chan->width == 320 || chan->width == 352)
                chan->use_cif_resolution = 1;
        else
                chan->use_cif_resolution = 0;

        chan->cif_width = chan->width;
        medusa_set_resolution(dev, chan->width, SRAM_CH00);
        return 0;
}

static int vidioc_log_status(struct file *file, void *priv)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;
        const struct sram_channel *sram_ch = chan->sram_channels;
        u32 tmp = 0;

        tmp = cx_read(sram_ch->dma_ctl);
        pr_info("Video input 0 is %s\n",
                (tmp & 0x11) ? "streaming" : "stopped");
        return 0;
}


static int cx25821_vidioc_querycap(struct file *file, void *priv,
                            struct v4l2_capability *cap)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;
        const u32 cap_input = V4L2_CAP_VIDEO_CAPTURE |
                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
        const u32 cap_output = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_READWRITE;

        strcpy(cap->driver, "cx25821");
        strlcpy(cap->card, cx25821_boards[dev->board].name, sizeof(cap->card));
        sprintf(cap->bus_info, "PCIe:%s", pci_name(dev->pci));
        if (chan->id >= VID_CHANNEL_NUM)
                cap->device_caps = cap_output;
        else
                cap->device_caps = cap_input;
        cap->capabilities = cap_input | cap_output | V4L2_CAP_DEVICE_CAPS;
        return 0;
}

static int cx25821_vidioc_g_std(struct file *file, void *priv, v4l2_std_id *tvnorms)
{
        struct cx25821_channel *chan = video_drvdata(file);

        *tvnorms = chan->dev->tvnorm;
        return 0;
}

static int cx25821_vidioc_s_std(struct file *file, void *priv,
                                v4l2_std_id tvnorms)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;

        if (dev->tvnorm == tvnorms)
                return 0;

        dev->tvnorm = tvnorms;
        chan->width = 720;
        chan->height = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;

        medusa_set_videostandard(dev);

        return 0;
}

static int cx25821_vidioc_enum_input(struct file *file, void *priv,
                              struct v4l2_input *i)
{
        if (i->index)
                return -EINVAL;

        i->type = V4L2_INPUT_TYPE_CAMERA;
        i->std = CX25821_NORMS;
        strcpy(i->name, "Composite");
        return 0;
}

static int cx25821_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
        *i = 0;
        return 0;
}

static int cx25821_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
        return i ? -EINVAL : 0;
}

static int cx25821_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct cx25821_channel *chan =
                container_of(ctrl->handler, struct cx25821_channel, hdl);
        struct cx25821_dev *dev = chan->dev;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                medusa_set_brightness(dev, ctrl->val, chan->id);
                break;
        case V4L2_CID_HUE:
                medusa_set_hue(dev, ctrl->val, chan->id);
                break;
        case V4L2_CID_CONTRAST:
                medusa_set_contrast(dev, ctrl->val, chan->id);
                break;
        case V4L2_CID_SATURATION:
                medusa_set_saturation(dev, ctrl->val, chan->id);
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int cx25821_vidioc_enum_output(struct file *file, void *priv,
                              struct v4l2_output *o)
{
        if (o->index)
                return -EINVAL;

        o->type = V4L2_INPUT_TYPE_CAMERA;
        o->std = CX25821_NORMS;
        strcpy(o->name, "Composite");
        return 0;
}

static int cx25821_vidioc_g_output(struct file *file, void *priv, unsigned int *o)
{
        *o = 0;
        return 0;
}

static int cx25821_vidioc_s_output(struct file *file, void *priv, unsigned int o)
{
        return o ? -EINVAL : 0;
}

static int cx25821_vidioc_try_fmt_vid_out(struct file *file, void *priv,
                                   struct v4l2_format *f)
{
        struct cx25821_channel *chan = video_drvdata(file);
        struct cx25821_dev *dev = chan->dev;
        const struct cx25821_fmt *fmt;

        fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
        if (NULL == fmt)
                return -EINVAL;
        f->fmt.pix.width = 720;
        f->fmt.pix.height = (dev->tvnorm & V4L2_STD_625_50) ? 576 : 480;
        f->fmt.pix.field = V4L2_FIELD_INTERLACED;
        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;
}

static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *f)
{
        struct cx25821_channel *chan = video_drvdata(file);
        int err;

        err = cx25821_vidioc_try_fmt_vid_out(file, priv, f);

        if (0 != err)
                return err;

        chan->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
        chan->field = f->fmt.pix.field;
        chan->width = f->fmt.pix.width;
        chan->height = f->fmt.pix.height;
        if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
                chan->pixel_formats = PIXEL_FRMT_411;
        else
                chan->pixel_formats = PIXEL_FRMT_422;
        return 0;
}

static const struct v4l2_ctrl_ops cx25821_ctrl_ops = {
        .s_ctrl = cx25821_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,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
        .vidioc_querycap = cx25821_vidioc_querycap,
        .vidioc_enum_fmt_vid_cap = cx25821_vidioc_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap = cx25821_vidioc_g_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap = cx25821_vidioc_try_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
        .vidioc_reqbufs       = vb2_ioctl_reqbufs,
        .vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
        .vidioc_create_bufs   = vb2_ioctl_create_bufs,
        .vidioc_querybuf      = vb2_ioctl_querybuf,
        .vidioc_qbuf          = vb2_ioctl_qbuf,
        .vidioc_dqbuf         = vb2_ioctl_dqbuf,
        .vidioc_streamon      = vb2_ioctl_streamon,
        .vidioc_streamoff     = vb2_ioctl_streamoff,
        .vidioc_g_std = cx25821_vidioc_g_std,
        .vidioc_s_std = cx25821_vidioc_s_std,
        .vidioc_enum_input = cx25821_vidioc_enum_input,
        .vidioc_g_input = cx25821_vidioc_g_input,
        .vidioc_s_input = cx25821_vidioc_s_input,
        .vidioc_log_status = vidioc_log_status,
        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

static const struct video_device cx25821_video_device = {
        .name = "cx25821-video",
        .fops = &video_fops,
        .release = video_device_release_empty,
        .minor = -1,
        .ioctl_ops = &video_ioctl_ops,
        .tvnorms = CX25821_NORMS,
};

static const struct v4l2_file_operations video_out_fops = {
        .owner = THIS_MODULE,
        .open = v4l2_fh_open,
        .release        = vb2_fop_release,
        .write          = vb2_fop_write,
        .poll           = vb2_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
};

static const struct v4l2_ioctl_ops video_out_ioctl_ops = {
        .vidioc_querycap = cx25821_vidioc_querycap,
        .vidioc_enum_fmt_vid_out = cx25821_vidioc_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_out = cx25821_vidioc_g_fmt_vid_cap,
        .vidioc_try_fmt_vid_out = cx25821_vidioc_try_fmt_vid_out,
        .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out,
        .vidioc_g_std = cx25821_vidioc_g_std,
        .vidioc_s_std = cx25821_vidioc_s_std,
        .vidioc_enum_output = cx25821_vidioc_enum_output,
        .vidioc_g_output = cx25821_vidioc_g_output,
        .vidioc_s_output = cx25821_vidioc_s_output,
        .vidioc_log_status = vidioc_log_status,
};

static const struct video_device cx25821_video_out_device = {
        .name = "cx25821-video",
        .fops = &video_out_fops,
        .release = video_device_release_empty,
        .minor = -1,
        .ioctl_ops = &video_out_ioctl_ops,
        .tvnorms = CX25821_NORMS,
};

void cx25821_video_unregister(struct cx25821_dev *dev, int chan_num)
{
        cx_clear(PCI_INT_MSK, 1);

        if (video_is_registered(&dev->channels[chan_num].vdev)) {
                video_unregister_device(&dev->channels[chan_num].vdev);
                v4l2_ctrl_handler_free(&dev->channels[chan_num].hdl);
        }
}

int cx25821_video_register(struct cx25821_dev *dev)
{
        int err;
        int i;

        /* initial device configuration */
        dev->tvnorm = V4L2_STD_NTSC_M;

        spin_lock_init(&dev->slock);

        for (i = 0; i < MAX_VID_CAP_CHANNEL_NUM - 1; ++i) {
                struct cx25821_channel *chan = &dev->channels[i];
                struct video_device *vdev = &chan->vdev;
                struct v4l2_ctrl_handler *hdl = &chan->hdl;
                struct vb2_queue *q;
                bool is_output = i > SRAM_CH08;

                if (i == SRAM_CH08) /* audio channel */
                        continue;

                if (!is_output) {
                        v4l2_ctrl_handler_init(hdl, 4);
                        v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
                                        V4L2_CID_BRIGHTNESS, 0, 10000, 1, 6200);
                        v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
                                        V4L2_CID_CONTRAST, 0, 10000, 1, 5000);
                        v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
                                        V4L2_CID_SATURATION, 0, 10000, 1, 5000);
                        v4l2_ctrl_new_std(hdl, &cx25821_ctrl_ops,
                                        V4L2_CID_HUE, 0, 10000, 1, 5000);
                        if (hdl->error) {
                                err = hdl->error;
                                goto fail_unreg;
                        }
                        err = v4l2_ctrl_handler_setup(hdl);
                        if (err)
                                goto fail_unreg;
                } else {
                        chan->out = &dev->vid_out_data[i - SRAM_CH09];
                        chan->out->chan = chan;
                }

                chan->sram_channels = &cx25821_sram_channels[i];
                chan->width = 720;
                chan->field = V4L2_FIELD_INTERLACED;
                if (dev->tvnorm & V4L2_STD_625_50)
                        chan->height = 576;
                else
                        chan->height = 480;

                if (chan->pixel_formats == PIXEL_FRMT_411)
                        chan->fmt = cx25821_format_by_fourcc(V4L2_PIX_FMT_Y41P);
                else
                        chan->fmt = cx25821_format_by_fourcc(V4L2_PIX_FMT_YUYV);

                cx_write(chan->sram_channels->int_stat, 0xffffffff);

                INIT_LIST_HEAD(&chan->dma_vidq.active);

                q = &chan->vidq;

                q->type = is_output ? V4L2_BUF_TYPE_VIDEO_OUTPUT :
                                      V4L2_BUF_TYPE_VIDEO_CAPTURE;
                q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
                q->io_modes |= is_output ? VB2_WRITE : VB2_READ;
                q->gfp_flags = GFP_DMA32;
                q->min_buffers_needed = 2;
                q->drv_priv = chan;
                q->buf_struct_size = sizeof(struct cx25821_buffer);
                q->ops = &cx25821_video_qops;
                q->mem_ops = &vb2_dma_sg_memops;
                q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
                q->lock = &dev->lock;
                q->dev = &dev->pci->dev;

                if (!is_output) {
                        err = vb2_queue_init(q);
                        if (err < 0)
                                goto fail_unreg;
                }

                /* register v4l devices */
                *vdev = is_output ? cx25821_video_out_device : cx25821_video_device;
                vdev->v4l2_dev = &dev->v4l2_dev;
                if (!is_output)
                        vdev->ctrl_handler = hdl;
                else
                        vdev->vfl_dir = VFL_DIR_TX;
                vdev->lock = &dev->lock;
                vdev->queue = q;
                snprintf(vdev->name, sizeof(vdev->name), "%s #%d", dev->name, i);
                video_set_drvdata(vdev, chan);

                err = video_register_device(vdev, VFL_TYPE_GRABBER,
                                            video_nr[dev->nr]);

                if (err < 0)
                        goto fail_unreg;
        }

        /* set PCI interrupt */
        cx_set(PCI_INT_MSK, 0xff);

        return 0;

fail_unreg:
        while (i >= 0)
                cx25821_video_unregister(dev, i--);
        return err;
}