cx25821-video.c

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/*
 *  Driver for the Conexant CX25821 PCIe bridge
 *
 *  Copyright (C) 2009 Conexant Systems Inc.
 *  Authors  <[email protected]>, <[email protected]>
 *  Based on Steven Toth <[email protected]> cx23885 driver
 *  Parts adapted/taken from Eduardo Moscoso Rubino
 *  Copyright (C) 2009 Eduardo Moscoso Rubino <[email protected]>
 *
 *
 *  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 <[email protected]>");
MODULE_LICENSE("GPL");

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

module_param_array(video_nr, int, NULL, 0444);
module_param_array(radio_nr, int, NULL, 0444);

MODULE_PARM_DESC(video_nr, "video device numbers");
MODULE_PARM_DESC(radio_nr, "radio 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]");

unsigned int vid_limit = 16;
module_param(vid_limit, int, 0644);
MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");

static void cx25821_init_controls(struct cx25821_dev *dev, int chan_num);

static const struct v4l2_file_operations video_fops;
static const struct v4l2_ioctl_ops video_ioctl_ops;

#define FORMAT_FLAGS_PACKED       0x01

struct cx25821_fmt formats[] = {
    {
        .name = "8 bpp, gray",
        .fourcc = V4L2_PIX_FMT_GREY,
        .depth = 8,
        .flags = FORMAT_FLAGS_PACKED,
     }, {
        .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,
    }, {
        .name = "4:2:2, packed, UYVY",
        .fourcc = V4L2_PIX_FMT_UYVY,
        .depth = 16,
        .flags = FORMAT_FLAGS_PACKED,
    }, {
        .name = "4:2:0, YUV",
        .fourcc = V4L2_PIX_FMT_YUV420,
        .depth = 12,
        .flags = FORMAT_FLAGS_PACKED,
    },
};

int cx25821_get_format_size(void)
{
    return ARRAY_SIZE(formats);
}

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

    if (fourcc == V4L2_PIX_FMT_Y41P || fourcc == V4L2_PIX_FMT_YUV411P)
        return formats + 1;

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

    pr_err("%s(0x%08x) NOT FOUND\n", __func__, fourcc);
    return NULL;
}

void cx25821_video_wakeup(struct cx25821_dev *dev, struct cx25821_dmaqueue *q,
              u32 count)
{
    struct cx25821_buffer *buf;
    int bc;

    for (bc = 0;; bc++) {
        if (list_empty(&q->active)) {
            dprintk(1, "bc=%d (=0: active empty)\n", bc);
            break;
        }

        buf = list_entry(q->active.next, struct cx25821_buffer,
                vb.queue);

        /* count comes from the hw and it is 16bit wide --
         * this trick handles wrap-arounds correctly for
         * up to 32767 buffers in flight... */
        if ((s16) (count - buf->count) < 0)
            break;

        do_gettimeofday(&buf->vb.ts);
        buf->vb.state = VIDEOBUF_DONE;
        list_del(&buf->vb.queue);
        wake_up(&buf->vb.done);
    }

    if (list_empty(&q->active))
        del_timer(&q->timeout);
    else
        mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
    if (bc != 1)
        pr_err("%s: %d buffers handled (should be 1)\n", __func__, bc);
}

#ifdef TUNER_FLAG
int cx25821_set_tvnorm(struct cx25821_dev *dev, v4l2_std_id norm)
{
    dprintk(1, "%s(norm = 0x%08x) name: [%s]\n",
        __func__, (unsigned int)norm, v4l2_norm_to_name(norm));

    dev->tvnorm = norm;

    /* Tell the internal A/V decoder */
    cx25821_call_all(dev, core, s_std, norm);

    return 0;
}
#endif

struct video_device *cx25821_vdev_init(struct cx25821_dev *dev,
                       struct pci_dev *pci,
                       struct video_device *template,
                       char *type)
{
    struct video_device *vfd;
    dprintk(1, "%s()\n", __func__);

    vfd = video_device_alloc();
    if (NULL == vfd)
        return NULL;
    *vfd = *template;
    vfd->v4l2_dev = &dev->v4l2_dev;
    vfd->release = video_device_release;
    snprintf(vfd->name, sizeof(vfd->name), "%s %s (%s)", dev->name, type,
         cx25821_boards[dev->board].name);
    video_set_drvdata(vfd, dev);
    return vfd;
}

/*
static int cx25821_ctrl_query(struct v4l2_queryctrl *qctrl)
{
    int i;

    if (qctrl->id < V4L2_CID_BASE || qctrl->id >= V4L2_CID_LASTP1)
        return -EINVAL;
    for (i = 0; i < CX25821_CTLS; i++)
        if (cx25821_ctls[i].v.id == qctrl->id)
            break;
    if (i == CX25821_CTLS) {
        *qctrl = no_ctl;
        return 0;
    }
    *qctrl = cx25821_ctls[i].v;
    return 0;
}
*/

/* resource management */
int cx25821_res_get(struct cx25821_dev *dev, struct cx25821_fh *fh,
            unsigned int bit)
{
    dprintk(1, "%s()\n", __func__);
    if (fh->resources & bit)
        /* have it already allocated */
        return 1;

    /* is it free? */
    mutex_lock(&dev->lock);
    if (dev->channels[fh->channel_id].resources & bit) {
        /* no, someone else uses it */
        mutex_unlock(&dev->lock);
        return 0;
    }
    /* it's free, grab it */
    fh->resources |= bit;
    dev->channels[fh->channel_id].resources |= bit;
    dprintk(1, "res: get %d\n", bit);
    mutex_unlock(&dev->lock);
    return 1;
}

int cx25821_res_check(struct cx25821_fh *fh, unsigned int bit)
{
    return fh->resources & bit;
}

int cx25821_res_locked(struct cx25821_fh *fh, unsigned int bit)
{
    return fh->dev->channels[fh->channel_id].resources & bit;
}

void cx25821_res_free(struct cx25821_dev *dev, struct cx25821_fh *fh,
              unsigned int bits)
{
    BUG_ON((fh->resources & bits) != bits);
    dprintk(1, "%s()\n", __func__);

    mutex_lock(&dev->lock);
    fh->resources &= ~bits;
    dev->channels[fh->channel_id].resources &= ~bits;
    dprintk(1, "res: put %d\n", bits);
    mutex_unlock(&dev->lock);
}

int cx25821_video_mux(struct cx25821_dev *dev, unsigned int input)
{
    struct v4l2_routing route;
    memset(&route, 0, sizeof(route));

    dprintk(1, "%s(): video_mux: %d [vmux=%d, gpio=0x%x,0x%x,0x%x,0x%x]\n",
        __func__, input, INPUT(input)->vmux, INPUT(input)->gpio0,
        INPUT(input)->gpio1, INPUT(input)->gpio2, INPUT(input)->gpio3);
    dev->input = input;

    route.input = INPUT(input)->vmux;

    /* Tell the internal A/V decoder */
    cx25821_call_all(dev, video, s_routing, INPUT(input)->vmux, 0, 0);

    return 0;
}

int cx25821_start_video_dma(struct cx25821_dev *dev,
                struct cx25821_dmaqueue *q,
                struct cx25821_buffer *buf,
                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);
    q->count = 1;

    /* 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_restart_video_queue(struct cx25821_dev *dev,
                struct cx25821_dmaqueue *q,
                struct sram_channel *channel)
{
    struct cx25821_buffer *buf, *prev;
    struct list_head *item;

    if (!list_empty(&q->active)) {
        buf = list_entry(q->active.next, struct cx25821_buffer,
                vb.queue);

        cx25821_start_video_dma(dev, q, buf, channel);

        list_for_each(item, &q->active) {
            buf = list_entry(item, struct cx25821_buffer, vb.queue);
            buf->count = q->count++;
        }

        mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
        return 0;
    }

    prev = NULL;
    for (;;) {
        if (list_empty(&q->queued))
            return 0;

        buf = list_entry(q->queued.next, struct cx25821_buffer,
                vb.queue);

        if (NULL == prev) {
            list_move_tail(&buf->vb.queue, &q->active);
            cx25821_start_video_dma(dev, q, buf, channel);
            buf->vb.state = VIDEOBUF_ACTIVE;
            buf->count = q->count++;
            mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
        } else if (prev->vb.width == buf->vb.width &&
               prev->vb.height == buf->vb.height &&
               prev->fmt == buf->fmt) {
            list_move_tail(&buf->vb.queue, &q->active);
            buf->vb.state = VIDEOBUF_ACTIVE;
            buf->count = q->count++;
            prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
            prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63 - 32 */
        } else {
            return 0;
        }
        prev = buf;
    }
}

void cx25821_vid_timeout(unsigned long data)
{
    struct cx25821_data *timeout_data = (struct cx25821_data *)data;
    struct cx25821_dev *dev = timeout_data->dev;
    struct sram_channel *channel = timeout_data->channel;
    struct cx25821_dmaqueue *q = &dev->channels[channel->i].vidq;
    struct cx25821_buffer *buf;
    unsigned long flags;

    /* cx25821_sram_channel_dump(dev, channel); */
    cx_clear(channel->dma_ctl, 0x11);

    spin_lock_irqsave(&dev->slock, flags);
    while (!list_empty(&q->active)) {
        buf = list_entry(q->active.next, struct cx25821_buffer,
                vb.queue);
        list_del(&buf->vb.queue);

        buf->vb.state = VIDEOBUF_ERROR;
        wake_up(&buf->vb.done);
    }

    cx25821_restart_video_queue(dev, q, channel);
    spin_unlock_irqrestore(&dev->slock, flags);
}

int cx25821_video_irq(struct cx25821_dev *dev, int chan_num, u32 status)
{
    u32 count = 0;
    int handled = 0;
    u32 mask;
    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) {
        spin_lock(&dev->slock);
        count = cx_read(channel->gpcnt);
        cx25821_video_wakeup(dev, &dev->channels[channel->i].vidq,
                count);
        spin_unlock(&dev->slock);
        handled++;
    }

    /* risc2 y */
    if (status & 0x10) {
        dprintk(2, "stopper video\n");
        spin_lock(&dev->slock);
        cx25821_restart_video_queue(dev,
                &dev->channels[channel->i].vidq, channel);
        spin_unlock(&dev->slock);
        handled++;
    }
    return handled;
}

void cx25821_videoioctl_unregister(struct cx25821_dev *dev)
{
    if (dev->ioctl_dev) {
        if (video_is_registered(dev->ioctl_dev))
            video_unregister_device(dev->ioctl_dev);
        else
            video_device_release(dev->ioctl_dev);

        dev->ioctl_dev = NULL;
    }
}

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

    if (dev->channels[chan_num].video_dev) {
        if (video_is_registered(dev->channels[chan_num].video_dev))
            video_unregister_device(
                    dev->channels[chan_num].video_dev);
        else
            video_device_release(
                    dev->channels[chan_num].video_dev);

        dev->channels[chan_num].video_dev = NULL;

        btcx_riscmem_free(dev->pci,
                &dev->channels[chan_num].vidq.stopper);

        pr_warn("device %d released!\n", chan_num);
    }

}

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

    struct video_device cx25821_video_device = {
        .name = "cx25821-video",
        .fops = &video_fops,
        .minor = -1,
        .ioctl_ops = &video_ioctl_ops,
        .tvnorms = CX25821_NORMS,
        .current_norm = V4L2_STD_NTSC_M,
    };

    spin_lock_init(&dev->slock);

    for (i = 0; i < MAX_VID_CHANNEL_NUM - 1; ++i) {
        cx25821_init_controls(dev, i);

        cx25821_risc_stopper(dev->pci, &dev->channels[i].vidq.stopper,
            dev->channels[i].sram_channels->dma_ctl, 0x11, 0);

        dev->channels[i].sram_channels = &cx25821_sram_channels[i];
        dev->channels[i].video_dev = NULL;
        dev->channels[i].resources = 0;

        cx_write(dev->channels[i].sram_channels->int_stat, 0xffffffff);

        INIT_LIST_HEAD(&dev->channels[i].vidq.active);
        INIT_LIST_HEAD(&dev->channels[i].vidq.queued);

        dev->channels[i].timeout_data.dev = dev;
        dev->channels[i].timeout_data.channel =
            &cx25821_sram_channels[i];
        dev->channels[i].vidq.timeout.function = cx25821_vid_timeout;
        dev->channels[i].vidq.timeout.data =
            (unsigned long)&dev->channels[i].timeout_data;
        init_timer(&dev->channels[i].vidq.timeout);

        /* register v4l devices */
        dev->channels[i].video_dev = cx25821_vdev_init(dev, dev->pci,
                &cx25821_video_device, "video");

        err = video_register_device(dev->channels[i].video_dev,
                VFL_TYPE_GRABBER, video_nr[dev->nr]);

        if (err < 0)
            goto fail_unreg;

    }

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

    /* initial device configuration */
    mutex_lock(&dev->lock);
#ifdef TUNER_FLAG
    dev->tvnorm = cx25821_video_device.current_norm;
    cx25821_set_tvnorm(dev, dev->tvnorm);
#endif
    mutex_unlock(&dev->lock);

    return 0;

fail_unreg:
    cx25821_video_unregister(dev, i);
    return err;
}

int cx25821_buffer_setup(struct videobuf_queue *q, unsigned int *count,
         unsigned int *size)
{
    struct cx25821_fh *fh = q->priv_data;

    *size = fh->fmt->depth * fh->width * fh->height >> 3;

    if (0 == *count)
        *count = 32;

    if (*size * *count > vid_limit * 1024 * 1024)
        *count = (vid_limit * 1024 * 1024) / *size;

    return 0;
}

int cx25821_buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
           enum v4l2_field field)
{
    struct cx25821_fh *fh = q->priv_data;
    struct cx25821_dev *dev = fh->dev;
    struct cx25821_buffer *buf =
        container_of(vb, struct cx25821_buffer, vb);
    int rc, init_buffer = 0;
    u32 line0_offset;
    struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
    int bpl_local = LINE_SIZE_D1;
    int channel_opened = fh->channel_id;

    BUG_ON(NULL == fh->fmt);
    if (fh->width < 48 || fh->width > 720 ||
        fh->height < 32 || fh->height > 576)
        return -EINVAL;

    buf->vb.size = (fh->width * fh->height * fh->fmt->depth) >> 3;

    if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
        return -EINVAL;

    if (buf->fmt != fh->fmt ||
        buf->vb.width != fh->width ||
        buf->vb.height != fh->height || buf->vb.field != field) {
        buf->fmt = fh->fmt;
        buf->vb.width = fh->width;
        buf->vb.height = fh->height;
        buf->vb.field = field;
        init_buffer = 1;
    }

    if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
        init_buffer = 1;
        rc = videobuf_iolock(q, &buf->vb, NULL);
        if (0 != rc) {
            printk(KERN_DEBUG pr_fmt("videobuf_iolock failed!\n"));
            goto fail;
        }
    }

    dprintk(1, "init_buffer=%d\n", init_buffer);

    if (init_buffer) {

        channel_opened = dev->channel_opened;
        if (channel_opened < 0 || channel_opened > 7)
            channel_opened = 7;

        if (dev->channels[channel_opened].pixel_formats ==
                PIXEL_FRMT_411)
            buf->bpl = (buf->fmt->depth * buf->vb.width) >> 3;
        else
            buf->bpl = (buf->fmt->depth >> 3) * (buf->vb.width);

        if (dev->channels[channel_opened].pixel_formats ==
                PIXEL_FRMT_411) {
            bpl_local = buf->bpl;
        } else {
            bpl_local = buf->bpl;   /* Default */

            if (channel_opened >= 0 && channel_opened <= 7) {
                if (dev->channels[channel_opened]
                        .use_cif_resolution) {
                    if (dev->tvnorm & V4L2_STD_PAL_BG ||
                        dev->tvnorm & V4L2_STD_PAL_DK)
                        bpl_local = 352 << 1;
                    else
                        bpl_local = dev->channels[
                            channel_opened].
                            cif_width << 1;
                }
            }
        }

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

            cx25821_risc_buffer(dev->pci, &buf->risc,
                        dma->sglist, line0_offset,
                        bpl_local, bpl_local, bpl_local,
                        buf->vb.height >> 1);
            break;
        case V4L2_FIELD_SEQ_TB:
            cx25821_risc_buffer(dev->pci, &buf->risc,
                        dma->sglist,
                        0, buf->bpl * (buf->vb.height >> 1),
                        buf->bpl, 0, buf->vb.height >> 1);
            break;
        case V4L2_FIELD_SEQ_BT:
            cx25821_risc_buffer(dev->pci, &buf->risc,
                        dma->sglist,
                        buf->bpl * (buf->vb.height >> 1), 0,
                        buf->bpl, 0, buf->vb.height >> 1);
            break;
        default:
            BUG();
        }
    }

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

    buf->vb.state = VIDEOBUF_PREPARED;

    return 0;

fail:
    cx25821_free_buffer(q, buf);
    return rc;
}

void cx25821_buffer_release(struct videobuf_queue *q,
                struct videobuf_buffer *vb)
{
    struct cx25821_buffer *buf =
        container_of(vb, struct cx25821_buffer, vb);

    cx25821_free_buffer(q, buf);
}

struct videobuf_queue *get_queue(struct cx25821_fh *fh)
{
    switch (fh->type) {
    case V4L2_BUF_TYPE_VIDEO_CAPTURE:
        return &fh->vidq;
    default:
        BUG();
        return NULL;
    }
}

int cx25821_get_resource(struct cx25821_fh *fh, int resource)
{
    switch (fh->type) {
    case V4L2_BUF_TYPE_VIDEO_CAPTURE:
        return resource;
    default:
        BUG();
        return 0;
    }
}

int cx25821_video_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct cx25821_fh *fh = file->private_data;

    return videobuf_mmap_mapper(get_queue(fh), vma);
}


static void buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
    struct cx25821_buffer *buf =
        container_of(vb, struct cx25821_buffer, vb);
    struct cx25821_buffer *prev;
    struct cx25821_fh *fh = vq->priv_data;
    struct cx25821_dev *dev = fh->dev;
    struct cx25821_dmaqueue *q = &dev->channels[fh->channel_id].vidq;

    /* add jump to stopper */
    buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
    buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
    buf->risc.jmp[2] = cpu_to_le32(0);      /* bits 63-32 */

    dprintk(2, "jmp to stopper (0x%x)\n", buf->risc.jmp[1]);

    if (!list_empty(&q->queued)) {
        list_add_tail(&buf->vb.queue, &q->queued);
        buf->vb.state = VIDEOBUF_QUEUED;
        dprintk(2, "[%p/%d] buffer_queue - append to queued\n", buf,
                buf->vb.i);

    } else if (list_empty(&q->active)) {
        list_add_tail(&buf->vb.queue, &q->active);
        cx25821_start_video_dma(dev, q, buf,
                dev->channels[fh->channel_id].sram_channels);
        buf->vb.state = VIDEOBUF_ACTIVE;
        buf->count = q->count++;
        mod_timer(&q->timeout, jiffies + BUFFER_TIMEOUT);
        dprintk(2, "[%p/%d] buffer_queue - first active, buf cnt = %d, q->count = %d\n",
                buf, buf->vb.i, buf->count, q->count);
    } else {
        prev = list_entry(q->active.prev, struct cx25821_buffer,
                vb.queue);
        if (prev->vb.width == buf->vb.width
           && prev->vb.height == buf->vb.height
           && prev->fmt == buf->fmt) {
            list_add_tail(&buf->vb.queue, &q->active);
            buf->vb.state = VIDEOBUF_ACTIVE;
            buf->count = q->count++;
            prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

            /* 64 bit bits 63-32 */
            prev->risc.jmp[2] = cpu_to_le32(0);
            dprintk(2, "[%p/%d] buffer_queue - append to active, buf->count=%d\n",
                    buf, buf->vb.i, buf->count);

        } else {
            list_add_tail(&buf->vb.queue, &q->queued);
            buf->vb.state = VIDEOBUF_QUEUED;
            dprintk(2, "[%p/%d] buffer_queue - first queued\n", buf,
                    buf->vb.i);
        }
    }

    if (list_empty(&q->active))
        dprintk(2, "active queue empty!\n");
}

static struct videobuf_queue_ops cx25821_video_qops = {
    .buf_setup = cx25821_buffer_setup,
    .buf_prepare = cx25821_buffer_prepare,
    .buf_queue = buffer_queue,
    .buf_release = cx25821_buffer_release,
};

static int video_open(struct file *file)
{
    struct video_device *vdev = video_devdata(file);
    struct cx25821_dev *h, *dev = video_drvdata(file);
    struct cx25821_fh *fh;
    struct list_head *list;
    int minor = video_devdata(file)->minor;
    enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    u32 pix_format;
    int ch_id = 0;
    int i;

    dprintk(1, "open dev=%s type=%s\n", video_device_node_name(vdev),
            v4l2_type_names[type]);

    /* allocate + initialize per filehandle data */
    fh = kzalloc(sizeof(*fh), GFP_KERNEL);
    if (NULL == fh)
        return -ENOMEM;

    mutex_lock(&cx25821_devlist_mutex);

    list_for_each(list, &cx25821_devlist)
    {
        h = list_entry(list, struct cx25821_dev, devlist);

        for (i = 0; i < MAX_VID_CHANNEL_NUM; i++) {
            if (h->channels[i].video_dev &&
                h->channels[i].video_dev->minor == minor) {
                dev = h;
                ch_id = i;
                type  = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            }
        }
    }

    if (NULL == dev) {
        mutex_unlock(&cx25821_devlist_mutex);
        kfree(fh);
        return -ENODEV;
    }

    file->private_data = fh;
    fh->dev = dev;
    fh->type = type;
    fh->width = 720;
    fh->channel_id = ch_id;

    if (dev->tvnorm & V4L2_STD_PAL_BG || dev->tvnorm & V4L2_STD_PAL_DK)
        fh->height = 576;
    else
        fh->height = 480;

    dev->channel_opened = fh->channel_id;
    if (dev->channels[ch_id].pixel_formats == PIXEL_FRMT_411)
        pix_format = V4L2_PIX_FMT_Y41P;
    else
        pix_format = V4L2_PIX_FMT_YUYV;
    fh->fmt = cx25821_format_by_fourcc(pix_format);

    v4l2_prio_open(&dev->channels[ch_id].prio, &fh->prio);

    videobuf_queue_sg_init(&fh->vidq, &cx25821_video_qops, &dev->pci->dev,
            &dev->slock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
            V4L2_FIELD_INTERLACED, sizeof(struct cx25821_buffer),
            fh, NULL);

    dprintk(1, "post videobuf_queue_init()\n");
    mutex_unlock(&cx25821_devlist_mutex);

    return 0;
}

static ssize_t video_read(struct file *file, char __user * data, size_t count,
             loff_t *ppos)
{
    struct cx25821_fh *fh = file->private_data;

    switch (fh->type) {
    case V4L2_BUF_TYPE_VIDEO_CAPTURE:
        if (cx25821_res_locked(fh, RESOURCE_VIDEO0))
            return -EBUSY;

        return videobuf_read_one(&fh->vidq, data, count, ppos,
                    file->f_flags & O_NONBLOCK);

    default:
        BUG();
        return 0;
    }
}

static unsigned int video_poll(struct file *file,
                  struct poll_table_struct *wait)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_buffer *buf;

    if (cx25821_res_check(fh, RESOURCE_VIDEO0)) {
        /* streaming capture */
        if (list_empty(&fh->vidq.stream))
            return POLLERR;
        buf = list_entry(fh->vidq.stream.next,
                struct cx25821_buffer, vb.stream);
    } else {
        /* read() capture */
        buf = (struct cx25821_buffer *)fh->vidq.read_buf;
        if (NULL == buf)
            return POLLERR;
    }

    poll_wait(file, &buf->vb.done, wait);
    if (buf->vb.state == VIDEOBUF_DONE || buf->vb.state == VIDEOBUF_ERROR) {
        if (buf->vb.state == VIDEOBUF_DONE) {
            struct cx25821_dev *dev = fh->dev;

            if (dev && dev->channels[fh->channel_id]
                    .use_cif_resolution) {
                u8 cam_id = *((char *)buf->vb.baddr + 3);
                memcpy((char *)buf->vb.baddr,
                      (char *)buf->vb.baddr + (fh->width * 2),
                      (fh->width * 2));
                *((char *)buf->vb.baddr + 3) = cam_id;
            }
        }

        return POLLIN | POLLRDNORM;
    }

    return 0;
}

static int video_release(struct file *file)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_dev *dev = fh->dev;

    /* stop the risc engine and fifo */
    cx_write(channel0->dma_ctl, 0); /* FIFO and RISC disable */

    /* stop video capture */
    if (cx25821_res_check(fh, RESOURCE_VIDEO0)) {
        videobuf_queue_cancel(&fh->vidq);
        cx25821_res_free(dev, fh, RESOURCE_VIDEO0);
    }

    if (fh->vidq.read_buf) {
        cx25821_buffer_release(&fh->vidq, fh->vidq.read_buf);
        kfree(fh->vidq.read_buf);
    }

    videobuf_mmap_free(&fh->vidq);

    v4l2_prio_close(&dev->channels[fh->channel_id].prio, fh->prio);
    file->private_data = NULL;
    kfree(fh);

    return 0;
}

static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = fh->dev;

    if (unlikely(fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE))
        return -EINVAL;

    if (unlikely(i != fh->type))
        return -EINVAL;

    if (unlikely(!cx25821_res_get(dev, fh, cx25821_get_resource(fh,
                        RESOURCE_VIDEO0))))
        return -EBUSY;

    return videobuf_streamon(get_queue(fh));
}

static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = fh->dev;
    int err, res;

    if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;
    if (i != fh->type)
        return -EINVAL;

    res = cx25821_get_resource(fh, RESOURCE_VIDEO0);
    err = videobuf_streamoff(get_queue(fh));
    if (err < 0)
        return err;
    cx25821_res_free(dev, fh, res);
    return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
                struct v4l2_format *f)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    struct v4l2_mbus_framefmt mbus_fmt;
    int err;
    int pix_format = PIXEL_FRMT_422;

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }

    dprintk(2, "%s()\n", __func__);
    err = cx25821_vidioc_try_fmt_vid_cap(file, priv, f);

    if (0 != err)
        return err;

    fh->fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
    fh->vidq.field = f->fmt.pix.field;

    /* check if width and height is valid based on set standard */
    if (cx25821_is_valid_width(f->fmt.pix.width, dev->tvnorm))
        fh->width = f->fmt.pix.width;

    if (cx25821_is_valid_height(f->fmt.pix.height, dev->tvnorm))
        fh->height = f->fmt.pix.height;

    if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_Y41P)
        pix_format = PIXEL_FRMT_411;
    else if (f->fmt.pix.pixelformat == V4L2_PIX_FMT_YUYV)
        pix_format = PIXEL_FRMT_422;
    else
        return -EINVAL;

    cx25821_set_pixel_format(dev, SRAM_CH00, pix_format);

    /* check if cif resolution */
    if (fh->width == 320 || fh->width == 352)
        dev->channels[fh->channel_id].use_cif_resolution = 1;
    else
        dev->channels[fh->channel_id].use_cif_resolution = 0;

    dev->channels[fh->channel_id].cif_width = fh->width;
    medusa_set_resolution(dev, fh->width, SRAM_CH00);

    dprintk(2, "%s(): width=%d height=%d field=%d\n", __func__, fh->width,
        fh->height, fh->vidq.field);
    v4l2_fill_mbus_format(&mbus_fmt, &f->fmt.pix, V4L2_MBUS_FMT_FIXED);
    cx25821_call_all(dev, video, s_mbus_fmt, &mbus_fmt);

    return 0;
}

static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
    int ret_val = 0;
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

    ret_val = videobuf_dqbuf(get_queue(fh), p, file->f_flags & O_NONBLOCK);

    p->sequence = dev->channels[fh->channel_id].vidq.count;

    return ret_val;
}

static int vidioc_log_status(struct file *file, void *priv)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    struct cx25821_fh *fh = priv;
    char name[32 + 2];

    struct sram_channel *sram_ch = dev->channels[fh->channel_id]
                                .sram_channels;
    u32 tmp = 0;

    snprintf(name, sizeof(name), "%s/2", dev->name);
    pr_info("%s/2: ============  START LOG STATUS  ============\n",
        dev->name);
    cx25821_call_all(dev, core, log_status);
    tmp = cx_read(sram_ch->dma_ctl);
    pr_info("Video input 0 is %s\n",
        (tmp & 0x11) ? "streaming" : "stopped");
    pr_info("%s/2: =============  END LOG STATUS  =============\n",
        dev->name);
    return 0;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
            struct v4l2_control *ctl)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    int err;

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }

    return cx25821_set_control(dev, ctl, fh->channel_id);
}

/* VIDEO IOCTLS */
int cx25821_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
                 struct v4l2_format *f)
{
    struct cx25821_fh *fh = priv;

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

    return 0;
}

int cx25821_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                   struct v4l2_format *f)
{
    struct cx25821_fmt *fmt;
    enum v4l2_field field;
    unsigned int maxw, maxh;

    fmt = cx25821_format_by_fourcc(f->fmt.pix.pixelformat);
    if (NULL == fmt)
        return -EINVAL;

    field = f->fmt.pix.field;
    maxw = 720;
    maxh = 576;

    if (V4L2_FIELD_ANY == field) {
        if (f->fmt.pix.height > maxh / 2)
            field = V4L2_FIELD_INTERLACED;
        else
            field = V4L2_FIELD_TOP;
    }

    switch (field) {
    case V4L2_FIELD_TOP:
    case V4L2_FIELD_BOTTOM:
        maxh = maxh / 2;
        break;
    case V4L2_FIELD_INTERLACED:
        break;
    default:
        return -EINVAL;
    }

    f->fmt.pix.field = field;
    if (f->fmt.pix.height < 32)
        f->fmt.pix.height = 32;
    if (f->fmt.pix.height > maxh)
        f->fmt.pix.height = maxh;
    if (f->fmt.pix.width < 48)
        f->fmt.pix.width = 48;
    if (f->fmt.pix.width > maxw)
        f->fmt.pix.width = maxw;
    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;

    return 0;
}

int cx25821_vidioc_querycap(struct file *file, void *priv,
                struct v4l2_capability *cap)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

    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));
    cap->version = CX25821_VERSION_CODE;
    cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
        V4L2_CAP_STREAMING;
    if (UNSET != dev->tuner_type)
        cap->capabilities |= V4L2_CAP_TUNER;
    return 0;
}

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;
}

int cx25821_vidioc_reqbufs(struct file *file, void *priv,
               struct v4l2_requestbuffers *p)
{
    struct cx25821_fh *fh = priv;
    return videobuf_reqbufs(get_queue(fh), p);
}

int cx25821_vidioc_querybuf(struct file *file, void *priv,
                struct v4l2_buffer *p)
{
    struct cx25821_fh *fh = priv;
    return videobuf_querybuf(get_queue(fh), p);
}

int cx25821_vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
{
    struct cx25821_fh *fh = priv;
    return videobuf_qbuf(get_queue(fh), p);
}

int cx25821_vidioc_g_priority(struct file *file, void *f, enum v4l2_priority *p)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)f)->dev;
    struct cx25821_fh *fh = f;

    *p = v4l2_prio_max(&dev->channels[fh->channel_id].prio);

    return 0;
}

int cx25821_vidioc_s_priority(struct file *file, void *f,
                  enum v4l2_priority prio)
{
    struct cx25821_fh *fh = f;
    struct cx25821_dev *dev = ((struct cx25821_fh *)f)->dev;

    return v4l2_prio_change(&dev->channels[fh->channel_id].prio, &fh->prio,
            prio);
}

#ifdef TUNER_FLAG
int cx25821_vidioc_s_std(struct file *file, void *priv, v4l2_std_id * tvnorms)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    int err;

    dprintk(1, "%s()\n", __func__);

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }

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

    mutex_lock(&dev->lock);
    cx25821_set_tvnorm(dev, *tvnorms);
    mutex_unlock(&dev->lock);

    medusa_set_videostandard(dev);

    return 0;
}
#endif

int cx25821_enum_input(struct cx25821_dev *dev, struct v4l2_input *i)
{
    static const char * const iname[] = {
        [CX25821_VMUX_COMPOSITE] = "Composite",
        [CX25821_VMUX_SVIDEO] = "S-Video",
        [CX25821_VMUX_DEBUG] = "for debug only",
    };
    unsigned int n;
    dprintk(1, "%s()\n", __func__);

    n = i->index;
    if (n >= 2)
        return -EINVAL;

    if (0 == INPUT(n)->type)
        return -EINVAL;

    i->type = V4L2_INPUT_TYPE_CAMERA;
    strcpy(i->name, iname[INPUT(n)->type]);

    i->std = CX25821_NORMS;
    return 0;
}

int cx25821_vidioc_enum_input(struct file *file, void *priv,
                  struct v4l2_input *i)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    dprintk(1, "%s()\n", __func__);
    return cx25821_enum_input(dev, i);
}

int cx25821_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

    *i = dev->input;
    dprintk(1, "%s(): returns %d\n", __func__, *i);
    return 0;
}

int cx25821_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    int err;

    dprintk(1, "%s(%d)\n", __func__, i);

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }

    if (i >= CX25821_NR_INPUT) {
        dprintk(1, "%s(): -EINVAL\n", __func__);
        return -EINVAL;
    }

    mutex_lock(&dev->lock);
    cx25821_video_mux(dev, i);
    mutex_unlock(&dev->lock);
    return 0;
}

#ifdef TUNER_FLAG
int cx25821_vidioc_g_frequency(struct file *file, void *priv,
                   struct v4l2_frequency *f)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev = fh->dev;

    f->frequency = dev->freq;

    cx25821_call_all(dev, tuner, g_frequency, f);

    return 0;
}

int cx25821_set_freq(struct cx25821_dev *dev, struct v4l2_frequency *f)
{
    mutex_lock(&dev->lock);
    dev->freq = f->frequency;

    cx25821_call_all(dev, tuner, s_frequency, f);

    /* When changing channels it is required to reset TVAUDIO */
    msleep(10);

    mutex_unlock(&dev->lock);

    return 0;
}

int cx25821_vidioc_s_frequency(struct file *file, void *priv,
                   struct v4l2_frequency *f)
{
    struct cx25821_fh *fh = priv;
    struct cx25821_dev *dev;
    int err;

    if (fh) {
        dev = fh->dev;
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    } else {
        pr_err("Invalid fh pointer!\n");
        return -EINVAL;
    }

    return cx25821_set_freq(dev, f);
}
#endif

#ifdef CONFIG_VIDEO_ADV_DEBUG
int cx25821_vidioc_g_register(struct file *file, void *fh,
              struct v4l2_dbg_register *reg)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)fh)->dev;

    if (!v4l2_chip_match_host(&reg->match))
        return -EINVAL;

    cx25821_call_all(dev, core, g_register, reg);

    return 0;
}

int cx25821_vidioc_s_register(struct file *file, void *fh,
              struct v4l2_dbg_register *reg)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)fh)->dev;

    if (!v4l2_chip_match_host(&reg->match))
        return -EINVAL;

    cx25821_call_all(dev, core, s_register, reg);

    return 0;
}

#endif

#ifdef TUNER_FLAG
int cx25821_vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *t)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

    if (unlikely(UNSET == dev->tuner_type))
        return -EINVAL;
    if (0 != t->index)
        return -EINVAL;

    strcpy(t->name, "Television");
    t->type = V4L2_TUNER_ANALOG_TV;
    t->capability = V4L2_TUNER_CAP_NORM;
    t->rangehigh = 0xffffffffUL;

    t->signal = 0xffff; /* LOCKED */
    return 0;
}

int cx25821_vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *t)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    struct cx25821_fh *fh = priv;
    int err;

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }

    dprintk(1, "%s()\n", __func__);
    if (UNSET == dev->tuner_type)
        return -EINVAL;
    if (0 != t->index)
        return -EINVAL;

    return 0;
}

#endif
/*****************************************************************************/
static const struct v4l2_queryctrl no_ctl = {
    .name = "42",
    .flags = V4L2_CTRL_FLAG_DISABLED,
};

static struct v4l2_queryctrl cx25821_ctls[] = {
    /* --- video --- */
    {
        .id = V4L2_CID_BRIGHTNESS,
        .name = "Brightness",
        .minimum = 0,
        .maximum = 10000,
        .step = 1,
        .default_value = 6200,
        .type = V4L2_CTRL_TYPE_INTEGER,
    }, {
        .id = V4L2_CID_CONTRAST,
        .name = "Contrast",
        .minimum = 0,
        .maximum = 10000,
        .step = 1,
        .default_value = 5000,
        .type = V4L2_CTRL_TYPE_INTEGER,
    }, {
        .id = V4L2_CID_SATURATION,
        .name = "Saturation",
        .minimum = 0,
        .maximum = 10000,
        .step = 1,
        .default_value = 5000,
        .type = V4L2_CTRL_TYPE_INTEGER,
    }, {
        .id = V4L2_CID_HUE,
        .name = "Hue",
        .minimum = 0,
        .maximum = 10000,
        .step = 1,
        .default_value = 5000,
        .type = V4L2_CTRL_TYPE_INTEGER,
    }
};
static const int CX25821_CTLS = ARRAY_SIZE(cx25821_ctls);

static int cx25821_ctrl_query(struct v4l2_queryctrl *qctrl)
{
    int i;

    if (qctrl->id < V4L2_CID_BASE || qctrl->id >= V4L2_CID_LASTP1)
        return -EINVAL;
    for (i = 0; i < CX25821_CTLS; i++)
        if (cx25821_ctls[i].id == qctrl->id)
            break;
    if (i == CX25821_CTLS) {
        *qctrl = no_ctl;
        return 0;
    }
    *qctrl = cx25821_ctls[i];
    return 0;
}

int cx25821_vidioc_queryctrl(struct file *file, void *priv,
             struct v4l2_queryctrl *qctrl)
{
    return cx25821_ctrl_query(qctrl);
}

/* ------------------------------------------------------------------ */
/* VIDEO CTRL IOCTLS                                                  */

static const struct v4l2_queryctrl *ctrl_by_id(unsigned int id)
{
    unsigned int i;

    for (i = 0; i < CX25821_CTLS; i++)
        if (cx25821_ctls[i].id == id)
            return cx25821_ctls + i;
    return NULL;
}

int cx25821_vidioc_g_ctrl(struct file *file, void *priv,
              struct v4l2_control *ctl)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    struct cx25821_fh *fh = priv;

    const struct v4l2_queryctrl *ctrl;

    ctrl = ctrl_by_id(ctl->id);

    if (NULL == ctrl)
        return -EINVAL;
    switch (ctl->id) {
    case V4L2_CID_BRIGHTNESS:
        ctl->value = dev->channels[fh->channel_id].ctl_bright;
        break;
    case V4L2_CID_HUE:
        ctl->value = dev->channels[fh->channel_id].ctl_hue;
        break;
    case V4L2_CID_CONTRAST:
        ctl->value = dev->channels[fh->channel_id].ctl_contrast;
        break;
    case V4L2_CID_SATURATION:
        ctl->value = dev->channels[fh->channel_id].ctl_saturation;
        break;
    }
    return 0;
}

int cx25821_set_control(struct cx25821_dev *dev,
            struct v4l2_control *ctl, int chan_num)
{
    int err;
    const struct v4l2_queryctrl *ctrl;

    err = -EINVAL;

    ctrl = ctrl_by_id(ctl->id);

    if (NULL == ctrl)
        return err;

    switch (ctrl->type) {
    case V4L2_CTRL_TYPE_BOOLEAN:
    case V4L2_CTRL_TYPE_MENU:
    case V4L2_CTRL_TYPE_INTEGER:
        if (ctl->value < ctrl->minimum)
            ctl->value = ctrl->minimum;
        if (ctl->value > ctrl->maximum)
            ctl->value = ctrl->maximum;
        break;
    default:
        /* nothing */ ;
    }

    switch (ctl->id) {
    case V4L2_CID_BRIGHTNESS:
        dev->channels[chan_num].ctl_bright = ctl->value;
        medusa_set_brightness(dev, ctl->value, chan_num);
        break;
    case V4L2_CID_HUE:
        dev->channels[chan_num].ctl_hue = ctl->value;
        medusa_set_hue(dev, ctl->value, chan_num);
        break;
    case V4L2_CID_CONTRAST:
        dev->channels[chan_num].ctl_contrast = ctl->value;
        medusa_set_contrast(dev, ctl->value, chan_num);
        break;
    case V4L2_CID_SATURATION:
        dev->channels[chan_num].ctl_saturation = ctl->value;
        medusa_set_saturation(dev, ctl->value, chan_num);
        break;
    }

    err = 0;

    return err;
}

static void cx25821_init_controls(struct cx25821_dev *dev, int chan_num)
{
    struct v4l2_control ctrl;
    int i;
    for (i = 0; i < CX25821_CTLS; i++) {
        ctrl.id = cx25821_ctls[i].id;
        ctrl.value = cx25821_ctls[i].default_value;

        cx25821_set_control(dev, &ctrl, chan_num);
    }
}

int cx25821_vidioc_cropcap(struct file *file, void *priv,
               struct v4l2_cropcap *cropcap)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;

    if (cropcap->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
        return -EINVAL;
    cropcap->bounds.top = 0;
    cropcap->bounds.left = 0;
    cropcap->bounds.width = 720;
    cropcap->bounds.height = dev->tvnorm == V4L2_STD_PAL_BG ? 576 : 480;
    cropcap->pixelaspect.numerator =
        dev->tvnorm == V4L2_STD_PAL_BG ? 59 : 10;
    cropcap->pixelaspect.denominator =
        dev->tvnorm == V4L2_STD_PAL_BG ? 54 : 11;
    cropcap->defrect = cropcap->bounds;
    return 0;
}

int cx25821_vidioc_s_crop(struct file *file, void *priv, const struct v4l2_crop *crop)
{
    struct cx25821_dev *dev = ((struct cx25821_fh *)priv)->dev;
    struct cx25821_fh *fh = priv;
    int err;

    if (fh) {
        err = v4l2_prio_check(&dev->channels[fh->channel_id].prio,
                      fh->prio);
        if (0 != err)
            return err;
    }
    /* cx25821_vidioc_s_crop not supported */
    return -EINVAL;
}

int cx25821_vidioc_g_crop(struct file *file, void *priv, struct v4l2_crop *crop)
{
    /* cx25821_vidioc_g_crop not supported */
    return -EINVAL;
}

int cx25821_vidioc_querystd(struct file *file, void *priv, v4l2_std_id * norm)
{
    /* medusa does not support video standard sensing of current input */
    *norm = CX25821_NORMS;

    return 0;
}

int cx25821_is_valid_width(u32 width, v4l2_std_id tvnorm)
{
    if (tvnorm == V4L2_STD_PAL_BG) {
        if (width == 352 || width == 720)
            return 1;
        else
            return 0;
    }

    if (tvnorm == V4L2_STD_NTSC_M) {
        if (width == 320 || width == 352 || width == 720)
            return 1;
        else
            return 0;
    }
    return 0;
}

int cx25821_is_valid_height(u32 height, v4l2_std_id tvnorm)
{
    if (tvnorm == V4L2_STD_PAL_BG) {
        if (height == 576 || height == 288)
            return 1;
        else
            return 0;
    }

    if (tvnorm == V4L2_STD_NTSC_M) {
        if (height == 480 || height == 240)
            return 1;
        else
            return 0;
    }

    return 0;
}

static long video_ioctl_upstream9(struct file *file, unsigned int cmd,
                 unsigned long arg)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_dev *dev = fh->dev;
    int command = 0;
    struct upstream_user_struct *data_from_user;

    data_from_user = (struct upstream_user_struct *)arg;

    if (!data_from_user) {
        pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
        return 0;
    }

    command = data_from_user->command;

    if (command != UPSTREAM_START_VIDEO && command != UPSTREAM_STOP_VIDEO)
        return 0;

    dev->input_filename = data_from_user->input_filename;
    dev->input_audiofilename = data_from_user->input_filename;
    dev->vid_stdname = data_from_user->vid_stdname;
    dev->pixel_format = data_from_user->pixel_format;
    dev->channel_select = data_from_user->channel_select;
    dev->command = data_from_user->command;

    switch (command) {
    case UPSTREAM_START_VIDEO:
        cx25821_start_upstream_video_ch1(dev, data_from_user);
        break;

    case UPSTREAM_STOP_VIDEO:
        cx25821_stop_upstream_video_ch1(dev);
        break;
    }

    return 0;
}

static long video_ioctl_upstream10(struct file *file, unsigned int cmd,
                  unsigned long arg)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_dev *dev = fh->dev;
    int command = 0;
    struct upstream_user_struct *data_from_user;

    data_from_user = (struct upstream_user_struct *)arg;

    if (!data_from_user) {
        pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
        return 0;
    }

    command = data_from_user->command;

    if (command != UPSTREAM_START_VIDEO && command != UPSTREAM_STOP_VIDEO)
        return 0;

    dev->input_filename_ch2 = data_from_user->input_filename;
    dev->input_audiofilename = data_from_user->input_filename;
    dev->vid_stdname_ch2 = data_from_user->vid_stdname;
    dev->pixel_format_ch2 = data_from_user->pixel_format;
    dev->channel_select_ch2 = data_from_user->channel_select;
    dev->command_ch2 = data_from_user->command;

    switch (command) {
    case UPSTREAM_START_VIDEO:
        cx25821_start_upstream_video_ch2(dev, data_from_user);
        break;

    case UPSTREAM_STOP_VIDEO:
        cx25821_stop_upstream_video_ch2(dev);
        break;
    }

    return 0;
}

static long video_ioctl_upstream11(struct file *file, unsigned int cmd,
                  unsigned long arg)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_dev *dev = fh->dev;
    int command = 0;
    struct upstream_user_struct *data_from_user;

    data_from_user = (struct upstream_user_struct *)arg;

    if (!data_from_user) {
        pr_err("%s(): Upstream data is INVALID. Returning\n", __func__);
        return 0;
    }

    command = data_from_user->command;

    if (command != UPSTREAM_START_AUDIO && command != UPSTREAM_STOP_AUDIO)
        return 0;

    dev->input_filename = data_from_user->input_filename;
    dev->input_audiofilename = data_from_user->input_filename;
    dev->vid_stdname = data_from_user->vid_stdname;
    dev->pixel_format = data_from_user->pixel_format;
    dev->channel_select = data_from_user->channel_select;
    dev->command = data_from_user->command;

    switch (command) {
    case UPSTREAM_START_AUDIO:
        cx25821_start_upstream_audio(dev, data_from_user);
        break;

    case UPSTREAM_STOP_AUDIO:
        cx25821_stop_upstream_audio(dev);
        break;
    }

    return 0;
}

static long video_ioctl_set(struct file *file, unsigned int cmd,
               unsigned long arg)
{
    struct cx25821_fh *fh = file->private_data;
    struct cx25821_dev *dev = fh->dev;
    struct downstream_user_struct *data_from_user;
    int command;
    int width = 720;
    int selected_channel = 0;
    int pix_format = 0;
    int i = 0;
    int cif_enable = 0;
    int cif_width = 0;

    data_from_user = (struct downstream_user_struct *)arg;

    if (!data_from_user) {
        pr_err("%s(): User data is INVALID. Returning\n", __func__);
        return 0;
    }

    command = data_from_user->command;

    if (command != SET_VIDEO_STD && command != SET_PIXEL_FORMAT
       && command != ENABLE_CIF_RESOLUTION && command != REG_READ
       && command != REG_WRITE && command != MEDUSA_READ
       && command != MEDUSA_WRITE) {
        return 0;
    }

    switch (command) {
    case SET_VIDEO_STD:
        if (!strcmp(data_from_user->vid_stdname, "PAL"))
            dev->tvnorm = V4L2_STD_PAL_BG;
        else
            dev->tvnorm = V4L2_STD_NTSC_M;
        medusa_set_videostandard(dev);
        break;

    case SET_PIXEL_FORMAT:
        selected_channel = data_from_user->decoder_select;
        pix_format = data_from_user->pixel_format;

        if (!(selected_channel <= 7 && selected_channel >= 0)) {
            selected_channel -= 4;
            selected_channel = selected_channel % 8;
        }

        if (selected_channel >= 0)
            cx25821_set_pixel_format(dev, selected_channel,
                        pix_format);

        break;

    case ENABLE_CIF_RESOLUTION:
        selected_channel = data_from_user->decoder_select;
        cif_enable = data_from_user->cif_resolution_enable;
        cif_width = data_from_user->cif_width;

        if (cif_enable) {
            if (dev->tvnorm & V4L2_STD_PAL_BG
                || dev->tvnorm & V4L2_STD_PAL_DK) {
                width = 352;
            } else {
                width = cif_width;
                if (cif_width != 320 && cif_width != 352)
                    width = 320;
            }
        }

        if (!(selected_channel <= 7 && selected_channel >= 0)) {
            selected_channel -= 4;
            selected_channel = selected_channel % 8;
        }

        if (selected_channel <= 7 && selected_channel >= 0) {
            dev->channels[selected_channel].use_cif_resolution =
                cif_enable;
            dev->channels[selected_channel].cif_width = width;
        } else {
            for (i = 0; i < VID_CHANNEL_NUM; i++) {
                dev->channels[i].use_cif_resolution =
                    cif_enable;
                dev->channels[i].cif_width = width;
            }
        }

        medusa_set_resolution(dev, width, selected_channel);
        break;
    case REG_READ:
        data_from_user->reg_data = cx_read(data_from_user->reg_address);
        break;
    case REG_WRITE:
        cx_write(data_from_user->reg_address, data_from_user->reg_data);
        break;
    case MEDUSA_READ:
        cx25821_i2c_read(&dev->i2c_bus[0],
                     (u16) data_from_user->reg_address,
                     &data_from_user->reg_data);
        break;
    case MEDUSA_WRITE:
        cx25821_i2c_write(&dev->i2c_bus[0],
                  (u16) data_from_user->reg_address,
                  data_from_user->reg_data);
        break;
    }

    return 0;
}

static long cx25821_video_ioctl(struct file *file,
                unsigned int cmd, unsigned long arg)
{
    int ret = 0;

    struct cx25821_fh *fh = file->private_data;

    /* check to see if it's the video upstream */
    if (fh->channel_id == SRAM_CH09) {
        ret = video_ioctl_upstream9(file, cmd, arg);
        return ret;
    } else if (fh->channel_id == SRAM_CH10) {
        ret = video_ioctl_upstream10(file, cmd, arg);
        return ret;
    } else if (fh->channel_id == SRAM_CH11) {
        ret = video_ioctl_upstream11(file, cmd, arg);
        ret = video_ioctl_set(file, cmd, arg);
        return ret;
    }

    return video_ioctl2(file, cmd, arg);
}

/* exported stuff */
static const struct v4l2_file_operations video_fops = {
    .owner = THIS_MODULE,
    .open = video_open,
    .release = video_release,
    .read = video_read,
    .poll = video_poll,
    .mmap = cx25821_video_mmap,
    .ioctl = cx25821_video_ioctl,
};

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 = cx25821_vidioc_reqbufs,
    .vidioc_querybuf = cx25821_vidioc_querybuf,
    .vidioc_qbuf = cx25821_vidioc_qbuf,
    .vidioc_dqbuf = vidioc_dqbuf,
#ifdef TUNER_FLAG
    .vidioc_s_std = cx25821_vidioc_s_std,
    .vidioc_querystd = cx25821_vidioc_querystd,
#endif
    .vidioc_cropcap = cx25821_vidioc_cropcap,
    .vidioc_s_crop = cx25821_vidioc_s_crop,
    .vidioc_g_crop = cx25821_vidioc_g_crop,
    .vidioc_enum_input = cx25821_vidioc_enum_input,
    .vidioc_g_input = cx25821_vidioc_g_input,
    .vidioc_s_input = cx25821_vidioc_s_input,
    .vidioc_g_ctrl = cx25821_vidioc_g_ctrl,
    .vidioc_s_ctrl = vidioc_s_ctrl,
    .vidioc_queryctrl = cx25821_vidioc_queryctrl,
    .vidioc_streamon = vidioc_streamon,
    .vidioc_streamoff = vidioc_streamoff,
    .vidioc_log_status = vidioc_log_status,
    .vidioc_g_priority = cx25821_vidioc_g_priority,
    .vidioc_s_priority = cx25821_vidioc_s_priority,
#ifdef TUNER_FLAG
    .vidioc_g_tuner = cx25821_vidioc_g_tuner,
    .vidioc_s_tuner = cx25821_vidioc_s_tuner,
    .vidioc_g_frequency = cx25821_vidioc_g_frequency,
    .vidioc_s_frequency = cx25821_vidioc_s_frequency,
#endif
#ifdef CONFIG_VIDEO_ADV_DEBUG
    .vidioc_g_register = cx25821_vidioc_g_register,
    .vidioc_s_register = cx25821_vidioc_s_register,
#endif
};

struct video_device cx25821_videoioctl_template = {
    .name = "cx25821-videoioctl",
    .fops = &video_fops,
    .ioctl_ops = &video_ioctl_ops,
    .tvnorms = CX25821_NORMS,
    .current_norm = V4L2_STD_NTSC_M,
};