Merge branch 'for-linus' into for-next

[deliverable/linux.git] / drivers / media / video / v4l2-ioctl.c

/*
 * Video capture interface for Linux version 2
 *
 * A generic framework to process V4L2 ioctl commands.
 *
 * 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.
 *
 * Authors:     Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
 *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/version.h>

#include <linux/videodev2.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/videobuf2-core.h>

/* Zero out the end of the struct pointed to by p.  Everything after, but
 * not including, the specified field is cleared. */
#define CLEAR_AFTER_FIELD(p, field) \
        memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
        0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))

struct std_descr {
        v4l2_std_id std;
        const char *descr;
};

static const struct std_descr standards[] = {
        { V4L2_STD_NTSC,        "NTSC"      },
        { V4L2_STD_NTSC_M,      "NTSC-M"    },
        { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
        { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
        { V4L2_STD_NTSC_443,    "NTSC-443"  },
        { V4L2_STD_PAL,         "PAL"       },
        { V4L2_STD_PAL_BG,      "PAL-BG"    },
        { V4L2_STD_PAL_B,       "PAL-B"     },
        { V4L2_STD_PAL_B1,      "PAL-B1"    },
        { V4L2_STD_PAL_G,       "PAL-G"     },
        { V4L2_STD_PAL_H,       "PAL-H"     },
        { V4L2_STD_PAL_I,       "PAL-I"     },
        { V4L2_STD_PAL_DK,      "PAL-DK"    },
        { V4L2_STD_PAL_D,       "PAL-D"     },
        { V4L2_STD_PAL_D1,      "PAL-D1"    },
        { V4L2_STD_PAL_K,       "PAL-K"     },
        { V4L2_STD_PAL_M,       "PAL-M"     },
        { V4L2_STD_PAL_N,       "PAL-N"     },
        { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
        { V4L2_STD_PAL_60,      "PAL-60"    },
        { V4L2_STD_SECAM,       "SECAM"     },
        { V4L2_STD_SECAM_B,     "SECAM-B"   },
        { V4L2_STD_SECAM_G,     "SECAM-G"   },
        { V4L2_STD_SECAM_H,     "SECAM-H"   },
        { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
        { V4L2_STD_SECAM_D,     "SECAM-D"   },
        { V4L2_STD_SECAM_K,     "SECAM-K"   },
        { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
        { V4L2_STD_SECAM_L,     "SECAM-L"   },
        { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
        { 0,                    "Unknown"   }
};

/* video4linux standard ID conversion to standard name
 */
const char *v4l2_norm_to_name(v4l2_std_id id)
{
        u32 myid = id;
        int i;

        /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
           64 bit comparations. So, on that architecture, with some gcc
           variants, compilation fails. Currently, the max value is 30bit wide.
         */
        BUG_ON(myid != id);

        for (i = 0; standards[i].std; i++)
                if (myid == standards[i].std)
                        break;
        return standards[i].descr;
}
EXPORT_SYMBOL(v4l2_norm_to_name);

/* Returns frame period for the given standard */
void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
{
        if (id & V4L2_STD_525_60) {
                frameperiod->numerator = 1001;
                frameperiod->denominator = 30000;
        } else {
                frameperiod->numerator = 1;
                frameperiod->denominator = 25;
        }
}
EXPORT_SYMBOL(v4l2_video_std_frame_period);

/* Fill in the fields of a v4l2_standard structure according to the
   'id' and 'transmission' parameters.  Returns negative on error.  */
int v4l2_video_std_construct(struct v4l2_standard *vs,
                             int id, const char *name)
{
        vs->id = id;
        v4l2_video_std_frame_period(id, &vs->frameperiod);
        vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
        strlcpy(vs->name, name, sizeof(vs->name));
        return 0;
}
EXPORT_SYMBOL(v4l2_video_std_construct);

/* ----------------------------------------------------------------- */
/* some arrays for pretty-printing debug messages of enum types      */

const char *v4l2_field_names[] = {
        [V4L2_FIELD_ANY]        = "any",
        [V4L2_FIELD_NONE]       = "none",
        [V4L2_FIELD_TOP]        = "top",
        [V4L2_FIELD_BOTTOM]     = "bottom",
        [V4L2_FIELD_INTERLACED] = "interlaced",
        [V4L2_FIELD_SEQ_TB]     = "seq-tb",
        [V4L2_FIELD_SEQ_BT]     = "seq-bt",
        [V4L2_FIELD_ALTERNATE]  = "alternate",
        [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
        [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
};
EXPORT_SYMBOL(v4l2_field_names);

const char *v4l2_type_names[] = {
        [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
        [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
        [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
        [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
        [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
        [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
        [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
        [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
        [V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
        [V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
};
EXPORT_SYMBOL(v4l2_type_names);

static const char *v4l2_memory_names[] = {
        [V4L2_MEMORY_MMAP]    = "mmap",
        [V4L2_MEMORY_USERPTR] = "userptr",
        [V4L2_MEMORY_OVERLAY] = "overlay",
};

#define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
                           arr[a] : "unknown")

/* ------------------------------------------------------------------ */
/* debug help functions                                               */

static void v4l_print_querycap(const void *arg, bool write_only)
{
        const struct v4l2_capability *p = arg;

        pr_cont("driver=%s, card=%s, bus=%s, version=0x%08x, "
                "capabilities=0x%08x, device_caps=0x%08x\n",
                p->driver, p->card, p->bus_info,
                p->version, p->capabilities, p->device_caps);
}

static void v4l_print_enuminput(const void *arg, bool write_only)
{
        const struct v4l2_input *p = arg;

        pr_cont("index=%u, name=%s, type=%u, audioset=0x%x, tuner=%u, "
                "std=0x%08Lx, status=0x%x, capabilities=0x%x\n",
                p->index, p->name, p->type, p->audioset, p->tuner,
                (unsigned long long)p->std, p->status, p->capabilities);
}

static void v4l_print_enumoutput(const void *arg, bool write_only)
{
        const struct v4l2_output *p = arg;

        pr_cont("index=%u, name=%s, type=%u, audioset=0x%x, "
                "modulator=%u, std=0x%08Lx, capabilities=0x%x\n",
                p->index, p->name, p->type, p->audioset, p->modulator,
                (unsigned long long)p->std, p->capabilities);
}

static void v4l_print_audio(const void *arg, bool write_only)
{
        const struct v4l2_audio *p = arg;

        if (write_only)
                pr_cont("index=%u, mode=0x%x\n", p->index, p->mode);
        else
                pr_cont("index=%u, name=%s, capability=0x%x, mode=0x%x\n",
                        p->index, p->name, p->capability, p->mode);
}

static void v4l_print_audioout(const void *arg, bool write_only)
{
        const struct v4l2_audioout *p = arg;

        if (write_only)
                pr_cont("index=%u\n", p->index);
        else
                pr_cont("index=%u, name=%s, capability=0x%x, mode=0x%x\n",
                        p->index, p->name, p->capability, p->mode);
}

static void v4l_print_fmtdesc(const void *arg, bool write_only)
{
        const struct v4l2_fmtdesc *p = arg;

        pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, description='%s'\n",
                p->index, prt_names(p->type, v4l2_type_names),
                p->flags, (p->pixelformat & 0xff),
                (p->pixelformat >>  8) & 0xff,
                (p->pixelformat >> 16) & 0xff,
                (p->pixelformat >> 24) & 0xff,
                p->description);
}

static void v4l_print_format(const void *arg, bool write_only)
{
        const struct v4l2_format *p = arg;
        const struct v4l2_pix_format *pix;
        const struct v4l2_pix_format_mplane *mp;
        const struct v4l2_vbi_format *vbi;
        const struct v4l2_sliced_vbi_format *sliced;
        const struct v4l2_window *win;
        const struct v4l2_clip *clip;
        unsigned i;

        pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
        switch (p->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                pix = &p->fmt.pix;
                pr_cont(", width=%u, height=%u, "
                        "pixelformat=%c%c%c%c, field=%s, "
                        "bytesperline=%u sizeimage=%u, colorspace=%d\n",
                        pix->width, pix->height,
                        (pix->pixelformat & 0xff),
                        (pix->pixelformat >>  8) & 0xff,
                        (pix->pixelformat >> 16) & 0xff,
                        (pix->pixelformat >> 24) & 0xff,
                        prt_names(pix->field, v4l2_field_names),
                        pix->bytesperline, pix->sizeimage,
                        pix->colorspace);
                break;
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                mp = &p->fmt.pix_mp;
                pr_cont(", width=%u, height=%u, "
                        "format=%c%c%c%c, field=%s, "
                        "colorspace=%d, num_planes=%u\n",
                        mp->width, mp->height,
                        (mp->pixelformat & 0xff),
                        (mp->pixelformat >>  8) & 0xff,
                        (mp->pixelformat >> 16) & 0xff,
                        (mp->pixelformat >> 24) & 0xff,
                        prt_names(mp->field, v4l2_field_names),
                        mp->colorspace, mp->num_planes);
                for (i = 0; i < mp->num_planes; i++)
                        printk(KERN_DEBUG "plane %u: bytesperline=%u sizeimage=%u\n", i,
                                        mp->plane_fmt[i].bytesperline,
                                        mp->plane_fmt[i].sizeimage);
                break;
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
                win = &p->fmt.win;
                pr_cont(", wxh=%dx%d, x,y=%d,%d, field=%s, "
                        "chromakey=0x%08x, bitmap=%p, "
                        "global_alpha=0x%02x\n",
                        win->w.width, win->w.height,
                        win->w.left, win->w.top,
                        prt_names(win->field, v4l2_field_names),
                        win->chromakey, win->bitmap, win->global_alpha);
                clip = win->clips;
                for (i = 0; i < win->clipcount; i++) {
                        printk(KERN_DEBUG "clip %u: wxh=%dx%d, x,y=%d,%d\n",
                                        i, clip->c.width, clip->c.height,
                                        clip->c.left, clip->c.top);
                        clip = clip->next;
                }
                break;
        case V4L2_BUF_TYPE_VBI_CAPTURE:
        case V4L2_BUF_TYPE_VBI_OUTPUT:
                vbi = &p->fmt.vbi;
                pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, "
                        "sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
                        vbi->sampling_rate, vbi->offset,
                        vbi->samples_per_line,
                        (vbi->sample_format & 0xff),
                        (vbi->sample_format >>  8) & 0xff,
                        (vbi->sample_format >> 16) & 0xff,
                        (vbi->sample_format >> 24) & 0xff,
                        vbi->start[0], vbi->start[1],
                        vbi->count[0], vbi->count[1]);
                break;
        case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
                sliced = &p->fmt.sliced;
                pr_cont(", service_set=0x%08x, io_size=%d\n",
                                sliced->service_set, sliced->io_size);
                for (i = 0; i < 24; i++)
                        printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
                                sliced->service_lines[0][i],
                                sliced->service_lines[1][i]);
                break;
        case V4L2_BUF_TYPE_PRIVATE:
                pr_cont("\n");
                break;
        }
}

static void v4l_print_framebuffer(const void *arg, bool write_only)
{
        const struct v4l2_framebuffer *p = arg;

        pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, "
                "height=%u, pixelformat=%c%c%c%c, "
                "bytesperline=%u sizeimage=%u, colorspace=%d\n",
                        p->capability, p->flags, p->base,
                        p->fmt.width, p->fmt.height,
                        (p->fmt.pixelformat & 0xff),
                        (p->fmt.pixelformat >>  8) & 0xff,
                        (p->fmt.pixelformat >> 16) & 0xff,
                        (p->fmt.pixelformat >> 24) & 0xff,
                        p->fmt.bytesperline, p->fmt.sizeimage,
                        p->fmt.colorspace);
}

static void v4l_print_buftype(const void *arg, bool write_only)
{
        pr_cont("type=%s\n", prt_names(*(u32 *)arg, v4l2_type_names));
}

static void v4l_print_modulator(const void *arg, bool write_only)
{
        const struct v4l2_modulator *p = arg;

        if (write_only)
                pr_cont("index=%u, txsubchans=0x%x", p->index, p->txsubchans);
        else
                pr_cont("index=%u, name=%s, capability=0x%x, "
                        "rangelow=%u, rangehigh=%u, txsubchans=0x%x\n",
                        p->index, p->name, p->capability,
                        p->rangelow, p->rangehigh, p->txsubchans);
}

static void v4l_print_tuner(const void *arg, bool write_only)
{
        const struct v4l2_tuner *p = arg;

        if (write_only)
                pr_cont("index=%u, audmode=%u\n", p->index, p->audmode);
        else
                pr_cont("index=%u, name=%s, type=%u, capability=0x%x, "
                        "rangelow=%u, rangehigh=%u, signal=%u, afc=%d, "
                        "rxsubchans=0x%x, audmode=%u\n",
                        p->index, p->name, p->type,
                        p->capability, p->rangelow,
                        p->rangehigh, p->signal, p->afc,
                        p->rxsubchans, p->audmode);
}

static void v4l_print_frequency(const void *arg, bool write_only)
{
        const struct v4l2_frequency *p = arg;

        pr_cont("tuner=%u, type=%u, frequency=%u\n",
                                p->tuner, p->type, p->frequency);
}

static void v4l_print_standard(const void *arg, bool write_only)
{
        const struct v4l2_standard *p = arg;

        pr_cont("index=%u, id=0x%Lx, name=%s, fps=%u/%u, "
                "framelines=%u\n", p->index,
                (unsigned long long)p->id, p->name,
                p->frameperiod.numerator,
                p->frameperiod.denominator,
                p->framelines);
}

static void v4l_print_std(const void *arg, bool write_only)
{
        pr_cont("std=0x%08Lx\n", *(const long long unsigned *)arg);
}

static void v4l_print_hw_freq_seek(const void *arg, bool write_only)
{
        const struct v4l2_hw_freq_seek *p = arg;

        pr_cont("tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u, "
                "rangelow=%u, rangehigh=%u\n",
                p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing,
                p->rangelow, p->rangehigh);
}

static void v4l_print_requestbuffers(const void *arg, bool write_only)
{
        const struct v4l2_requestbuffers *p = arg;

        pr_cont("count=%d, type=%s, memory=%s\n",
                p->count,
                prt_names(p->type, v4l2_type_names),
                prt_names(p->memory, v4l2_memory_names));
}

static void v4l_print_buffer(const void *arg, bool write_only)
{
        const struct v4l2_buffer *p = arg;
        const struct v4l2_timecode *tc = &p->timecode;
        const struct v4l2_plane *plane;
        int i;

        pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, "
                "flags=0x%08x, field=%s, sequence=%d, memory=%s",
                        p->timestamp.tv_sec / 3600,
                        (int)(p->timestamp.tv_sec / 60) % 60,
                        (int)(p->timestamp.tv_sec % 60),
                        (long)p->timestamp.tv_usec,
                        p->index,
                        prt_names(p->type, v4l2_type_names),
                        p->flags, prt_names(p->field, v4l2_field_names),
                        p->sequence, prt_names(p->memory, v4l2_memory_names));

        if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
                pr_cont("\n");
                for (i = 0; i < p->length; ++i) {
                        plane = &p->m.planes[i];
                        printk(KERN_DEBUG
                                "plane %d: bytesused=%d, data_offset=0x%08x "
                                "offset/userptr=0x%lx, length=%d\n",
                                i, plane->bytesused, plane->data_offset,
                                plane->m.userptr, plane->length);
                }
        } else {
                pr_cont("bytesused=%d, offset/userptr=0x%lx, length=%d\n",
                        p->bytesused, p->m.userptr, p->length);
        }

        printk(KERN_DEBUG "timecode=%02d:%02d:%02d type=%d, "
                "flags=0x%08x, frames=%d, userbits=0x%08x\n",
                        tc->hours, tc->minutes, tc->seconds,
                        tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
}

static void v4l_print_create_buffers(const void *arg, bool write_only)
{
        const struct v4l2_create_buffers *p = arg;

        pr_cont("index=%d, count=%d, memory=%s, ",
                        p->index, p->count,
                        prt_names(p->memory, v4l2_memory_names));
        v4l_print_format(&p->format, write_only);
}

static void v4l_print_streamparm(const void *arg, bool write_only)
{
        const struct v4l2_streamparm *p = arg;

        pr_cont("type=%s", prt_names(p->type, v4l2_type_names));

        if (p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
            p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
                const struct v4l2_captureparm *c = &p->parm.capture;

                pr_cont(", capability=0x%x, capturemode=0x%x, timeperframe=%d/%d, "
                        "extendedmode=%d, readbuffers=%d\n",
                        c->capability, c->capturemode,
                        c->timeperframe.numerator, c->timeperframe.denominator,
                        c->extendedmode, c->readbuffers);
        } else if (p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
                   p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
                const struct v4l2_outputparm *c = &p->parm.output;

                pr_cont(", capability=0x%x, outputmode=0x%x, timeperframe=%d/%d, "
                        "extendedmode=%d, writebuffers=%d\n",
                        c->capability, c->outputmode,
                        c->timeperframe.numerator, c->timeperframe.denominator,
                        c->extendedmode, c->writebuffers);
        }
}

static void v4l_print_queryctrl(const void *arg, bool write_only)
{
        const struct v4l2_queryctrl *p = arg;

        pr_cont("id=0x%x, type=%d, name=%s, min/max=%d/%d, "
                "step=%d, default=%d, flags=0x%08x\n",
                        p->id, p->type, p->name,
                        p->minimum, p->maximum,
                        p->step, p->default_value, p->flags);
}

static void v4l_print_querymenu(const void *arg, bool write_only)
{
        const struct v4l2_querymenu *p = arg;

        pr_cont("id=0x%x, index=%d\n", p->id, p->index);
}

static void v4l_print_control(const void *arg, bool write_only)
{
        const struct v4l2_control *p = arg;

        pr_cont("id=0x%x, value=%d\n", p->id, p->value);
}

static void v4l_print_ext_controls(const void *arg, bool write_only)
{
        const struct v4l2_ext_controls *p = arg;
        int i;

        pr_cont("class=0x%x, count=%d, error_idx=%d",
                        p->ctrl_class, p->count, p->error_idx);
        for (i = 0; i < p->count; i++) {
                if (p->controls[i].size)
                        pr_cont(", id/val=0x%x/0x%x",
                                p->controls[i].id, p->controls[i].value);
                else
                        pr_cont(", id/size=0x%x/%u",
                                p->controls[i].id, p->controls[i].size);
        }
        pr_cont("\n");
}

static void v4l_print_cropcap(const void *arg, bool write_only)
{
        const struct v4l2_cropcap *p = arg;

        pr_cont("type=%s, bounds wxh=%dx%d, x,y=%d,%d, "
                "defrect wxh=%dx%d, x,y=%d,%d\n, "
                "pixelaspect %d/%d\n",
                prt_names(p->type, v4l2_type_names),
                p->bounds.width, p->bounds.height,
                p->bounds.left, p->bounds.top,
                p->defrect.width, p->defrect.height,
                p->defrect.left, p->defrect.top,
                p->pixelaspect.numerator, p->pixelaspect.denominator);
}

static void v4l_print_crop(const void *arg, bool write_only)
{
        const struct v4l2_crop *p = arg;

        pr_cont("type=%s, wxh=%dx%d, x,y=%d,%d\n",
                prt_names(p->type, v4l2_type_names),
                p->c.width, p->c.height,
                p->c.left, p->c.top);
}

static void v4l_print_selection(const void *arg, bool write_only)
{
        const struct v4l2_selection *p = arg;

        pr_cont("type=%s, target=%d, flags=0x%x, wxh=%dx%d, x,y=%d,%d\n",
                prt_names(p->type, v4l2_type_names),
                p->target, p->flags,
                p->r.width, p->r.height, p->r.left, p->r.top);
}

static void v4l_print_jpegcompression(const void *arg, bool write_only)
{
        const struct v4l2_jpegcompression *p = arg;

        pr_cont("quality=%d, APPn=%d, APP_len=%d, "
                "COM_len=%d, jpeg_markers=0x%x\n",
                p->quality, p->APPn, p->APP_len,
                p->COM_len, p->jpeg_markers);
}

static void v4l_print_enc_idx(const void *arg, bool write_only)
{
        const struct v4l2_enc_idx *p = arg;

        pr_cont("entries=%d, entries_cap=%d\n",
                        p->entries, p->entries_cap);
}

static void v4l_print_encoder_cmd(const void *arg, bool write_only)
{
        const struct v4l2_encoder_cmd *p = arg;

        pr_cont("cmd=%d, flags=0x%x\n",
                        p->cmd, p->flags);
}

static void v4l_print_decoder_cmd(const void *arg, bool write_only)
{
        const struct v4l2_decoder_cmd *p = arg;

        pr_cont("cmd=%d, flags=0x%x\n", p->cmd, p->flags);

        if (p->cmd == V4L2_DEC_CMD_START)
                pr_info("speed=%d, format=%u\n",
                                p->start.speed, p->start.format);
        else if (p->cmd == V4L2_DEC_CMD_STOP)
                pr_info("pts=%llu\n", p->stop.pts);
}

static void v4l_print_dbg_chip_ident(const void *arg, bool write_only)
{
        const struct v4l2_dbg_chip_ident *p = arg;

        pr_cont("type=%u, ", p->match.type);
        if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
                pr_cont("name=%s, ", p->match.name);
        else
                pr_cont("addr=%u, ", p->match.addr);
        pr_cont("chip_ident=%u, revision=0x%x\n",
                        p->ident, p->revision);
}

static void v4l_print_dbg_register(const void *arg, bool write_only)
{
        const struct v4l2_dbg_register *p = arg;

        pr_cont("type=%u, ", p->match.type);
        if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
                pr_cont("name=%s, ", p->match.name);
        else
                pr_cont("addr=%u, ", p->match.addr);
        pr_cont("reg=0x%llx, val=0x%llx\n",
                        p->reg, p->val);
}

static void v4l_print_dv_enum_presets(const void *arg, bool write_only)
{
        const struct v4l2_dv_enum_preset *p = arg;

        pr_cont("index=%u, preset=%u, name=%s, width=%u, height=%u\n",
                        p->index, p->preset, p->name, p->width, p->height);
}

static void v4l_print_dv_preset(const void *arg, bool write_only)
{
        const struct v4l2_dv_preset *p = arg;

        pr_cont("preset=%u\n", p->preset);
}

static void v4l_print_dv_timings(const void *arg, bool write_only)
{
        const struct v4l2_dv_timings *p = arg;

        switch (p->type) {
        case V4L2_DV_BT_656_1120:
                pr_cont("type=bt-656/1120, interlaced=%u, "
                        "pixelclock=%llu, "
                        "width=%u, height=%u, polarities=0x%x, "
                        "hfrontporch=%u, hsync=%u, "
                        "hbackporch=%u, vfrontporch=%u, "
                        "vsync=%u, vbackporch=%u, "
                        "il_vfrontporch=%u, il_vsync=%u, "
                        "il_vbackporch=%u, standards=0x%x, flags=0x%x\n",
                                p->bt.interlaced, p->bt.pixelclock,
                                p->bt.width, p->bt.height,
                                p->bt.polarities, p->bt.hfrontporch,
                                p->bt.hsync, p->bt.hbackporch,
                                p->bt.vfrontporch, p->bt.vsync,
                                p->bt.vbackporch, p->bt.il_vfrontporch,
                                p->bt.il_vsync, p->bt.il_vbackporch,
                                p->bt.standards, p->bt.flags);
                break;
        default:
                pr_cont("type=%d\n", p->type);
                break;
        }
}

static void v4l_print_enum_dv_timings(const void *arg, bool write_only)
{
        const struct v4l2_enum_dv_timings *p = arg;

        pr_cont("index=%u, ", p->index);
        v4l_print_dv_timings(&p->timings, write_only);
}

static void v4l_print_dv_timings_cap(const void *arg, bool write_only)
{
        const struct v4l2_dv_timings_cap *p = arg;

        switch (p->type) {
        case V4L2_DV_BT_656_1120:
                pr_cont("type=bt-656/1120, width=%u-%u, height=%u-%u, "
                        "pixelclock=%llu-%llu, standards=0x%x, capabilities=0x%x\n",
                        p->bt.min_width, p->bt.max_width,
                        p->bt.min_height, p->bt.max_height,
                        p->bt.min_pixelclock, p->bt.max_pixelclock,
                        p->bt.standards, p->bt.capabilities);
                break;
        default:
                pr_cont("type=%u\n", p->type);
                break;
        }
}

static void v4l_print_frmsizeenum(const void *arg, bool write_only)
{
        const struct v4l2_frmsizeenum *p = arg;

        pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
                        p->index,
                        (p->pixel_format & 0xff),
                        (p->pixel_format >>  8) & 0xff,
                        (p->pixel_format >> 16) & 0xff,
                        (p->pixel_format >> 24) & 0xff,
                        p->type);
        switch (p->type) {
        case V4L2_FRMSIZE_TYPE_DISCRETE:
                pr_cont(" wxh=%ux%u\n",
                        p->discrete.width, p->discrete.height);
                break;
        case V4L2_FRMSIZE_TYPE_STEPWISE:
                pr_cont(" min=%ux%u, max=%ux%u, step=%ux%u\n",
                                p->stepwise.min_width,  p->stepwise.min_height,
                                p->stepwise.step_width, p->stepwise.step_height,
                                p->stepwise.max_width,  p->stepwise.max_height);
                break;
        case V4L2_FRMSIZE_TYPE_CONTINUOUS:
                /* fall through */
        default:
                pr_cont("\n");
                break;
        }
}

static void v4l_print_frmivalenum(const void *arg, bool write_only)
{
        const struct v4l2_frmivalenum *p = arg;

        pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
                        p->index,
                        (p->pixel_format & 0xff),
                        (p->pixel_format >>  8) & 0xff,
                        (p->pixel_format >> 16) & 0xff,
                        (p->pixel_format >> 24) & 0xff,
                        p->width, p->height, p->type);
        switch (p->type) {
        case V4L2_FRMIVAL_TYPE_DISCRETE:
                pr_cont(" fps=%d/%d\n",
                                p->discrete.numerator,
                                p->discrete.denominator);
                break;
        case V4L2_FRMIVAL_TYPE_STEPWISE:
                pr_cont(" min=%d/%d, max=%d/%d, step=%d/%d\n",
                                p->stepwise.min.numerator,
                                p->stepwise.min.denominator,
                                p->stepwise.max.numerator,
                                p->stepwise.max.denominator,
                                p->stepwise.step.numerator,
                                p->stepwise.step.denominator);
                break;
        case V4L2_FRMIVAL_TYPE_CONTINUOUS:
                /* fall through */
        default:
                pr_cont("\n");
                break;
        }
}

static void v4l_print_event(const void *arg, bool write_only)
{
        const struct v4l2_event *p = arg;
        const struct v4l2_event_ctrl *c;

        pr_cont("type=0x%x, pending=%u, sequence=%u, id=%u, "
                "timestamp=%lu.%9.9lu\n",
                        p->type, p->pending, p->sequence, p->id,
                        p->timestamp.tv_sec, p->timestamp.tv_nsec);
        switch (p->type) {
        case V4L2_EVENT_VSYNC:
                printk(KERN_DEBUG "field=%s\n",
                        prt_names(p->u.vsync.field, v4l2_field_names));
                break;
        case V4L2_EVENT_CTRL:
                c = &p->u.ctrl;
                printk(KERN_DEBUG "changes=0x%x, type=%u, ",
                        c->changes, c->type);
                if (c->type == V4L2_CTRL_TYPE_INTEGER64)
                        pr_cont("value64=%lld, ", c->value64);
                else
                        pr_cont("value=%d, ", c->value);
                pr_cont("flags=0x%x, minimum=%d, maximum=%d, step=%d,"
                                " default_value=%d\n",
                        c->flags, c->minimum, c->maximum,
                        c->step, c->default_value);
                break;
        case V4L2_EVENT_FRAME_SYNC:
                pr_cont("frame_sequence=%u\n",
                        p->u.frame_sync.frame_sequence);
                break;
        }
}

static void v4l_print_event_subscription(const void *arg, bool write_only)
{
        const struct v4l2_event_subscription *p = arg;

        pr_cont("type=0x%x, id=0x%x, flags=0x%x\n",
                        p->type, p->id, p->flags);
}

static void v4l_print_sliced_vbi_cap(const void *arg, bool write_only)
{
        const struct v4l2_sliced_vbi_cap *p = arg;
        int i;

        pr_cont("type=%s, service_set=0x%08x\n",
                        prt_names(p->type, v4l2_type_names), p->service_set);
        for (i = 0; i < 24; i++)
                printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
                                p->service_lines[0][i],
                                p->service_lines[1][i]);
}

static void v4l_print_freq_band(const void *arg, bool write_only)
{
        const struct v4l2_frequency_band *p = arg;

        pr_cont("tuner=%u, type=%u, index=%u, capability=0x%x, "
                        "rangelow=%u, rangehigh=%u, modulation=0x%x\n",
                        p->tuner, p->type, p->index,
                        p->capability, p->rangelow,
                        p->rangehigh, p->modulation);
}

static void v4l_print_u32(const void *arg, bool write_only)
{
        pr_cont("value=%u\n", *(const u32 *)arg);
}

static void v4l_print_newline(const void *arg, bool write_only)
{
        pr_cont("\n");
}

static void v4l_print_default(const void *arg, bool write_only)
{
        pr_cont("driver-specific ioctl\n");
}

static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
{
        __u32 i;

        /* zero the reserved fields */
        c->reserved[0] = c->reserved[1] = 0;
        for (i = 0; i < c->count; i++)
                c->controls[i].reserved2[0] = 0;

        /* V4L2_CID_PRIVATE_BASE cannot be used as control class
           when using extended controls.
           Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
           is it allowed for backwards compatibility.
         */
        if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
                return 0;
        /* Check that all controls are from the same control class. */
        for (i = 0; i < c->count; i++) {
                if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
                        c->error_idx = i;
                        return 0;
                }
        }
        return 1;
}

static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
{
        if (ops == NULL)
                return -EINVAL;

        switch (type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                if (ops->vidioc_g_fmt_vid_cap ||
                                ops->vidioc_g_fmt_vid_cap_mplane)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                if (ops->vidioc_g_fmt_vid_cap_mplane)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
                if (ops->vidioc_g_fmt_vid_overlay)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                if (ops->vidioc_g_fmt_vid_out ||
                                ops->vidioc_g_fmt_vid_out_mplane)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                if (ops->vidioc_g_fmt_vid_out_mplane)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
                if (ops->vidioc_g_fmt_vid_out_overlay)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VBI_CAPTURE:
                if (ops->vidioc_g_fmt_vbi_cap)
                        return 0;
                break;
        case V4L2_BUF_TYPE_VBI_OUTPUT:
                if (ops->vidioc_g_fmt_vbi_out)
                        return 0;
                break;
        case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
                if (ops->vidioc_g_fmt_sliced_vbi_cap)
                        return 0;
                break;
        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
                if (ops->vidioc_g_fmt_sliced_vbi_out)
                        return 0;
                break;
        case V4L2_BUF_TYPE_PRIVATE:
                if (ops->vidioc_g_fmt_type_private)
                        return 0;
                break;
        }
        return -EINVAL;
}

static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_capability *cap = (struct v4l2_capability *)arg;

        cap->version = LINUX_VERSION_CODE;
        return ops->vidioc_querycap(file, fh, cap);
}

static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
}

static int v4l_s_output(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_s_output(file, fh, *(unsigned int *)arg);
}

static int v4l_g_priority(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd;
        u32 *p = arg;

        if (ops->vidioc_g_priority)
                return ops->vidioc_g_priority(file, fh, arg);
        vfd = video_devdata(file);
        *p = v4l2_prio_max(&vfd->v4l2_dev->prio);
        return 0;
}

static int v4l_s_priority(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd;
        struct v4l2_fh *vfh;
        u32 *p = arg;

        if (ops->vidioc_s_priority)
                return ops->vidioc_s_priority(file, fh, *p);
        vfd = video_devdata(file);
        vfh = file->private_data;
        return v4l2_prio_change(&vfd->v4l2_dev->prio, &vfh->prio, *p);
}

static int v4l_enuminput(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_input *p = arg;

        /*
         * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
         * CAP_STD here based on ioctl handler provided by the
         * driver. If the driver doesn't support these
         * for a specific input, it must override these flags.
         */
        if (ops->vidioc_s_std)
                p->capabilities |= V4L2_IN_CAP_STD;
        if (ops->vidioc_s_dv_preset)
                p->capabilities |= V4L2_IN_CAP_PRESETS;
        if (ops->vidioc_s_dv_timings)
                p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;

        return ops->vidioc_enum_input(file, fh, p);
}

static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_output *p = arg;

        /*
         * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
         * CAP_STD here based on ioctl handler provided by the
         * driver. If the driver doesn't support these
         * for a specific output, it must override these flags.
         */
        if (ops->vidioc_s_std)
                p->capabilities |= V4L2_OUT_CAP_STD;
        if (ops->vidioc_s_dv_preset)
                p->capabilities |= V4L2_OUT_CAP_PRESETS;
        if (ops->vidioc_s_dv_timings)
                p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;

        return ops->vidioc_enum_output(file, fh, p);
}

static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_fmtdesc *p = arg;

        switch (p->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                if (unlikely(!ops->vidioc_enum_fmt_vid_cap))
                        break;
                return ops->vidioc_enum_fmt_vid_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                if (unlikely(!ops->vidioc_enum_fmt_vid_cap_mplane))
                        break;
                return ops->vidioc_enum_fmt_vid_cap_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
                if (unlikely(!ops->vidioc_enum_fmt_vid_overlay))
                        break;
                return ops->vidioc_enum_fmt_vid_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                if (unlikely(!ops->vidioc_enum_fmt_vid_out))
                        break;
                return ops->vidioc_enum_fmt_vid_out(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                if (unlikely(!ops->vidioc_enum_fmt_vid_out_mplane))
                        break;
                return ops->vidioc_enum_fmt_vid_out_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_PRIVATE:
                if (unlikely(!ops->vidioc_enum_fmt_type_private))
                        break;
                return ops->vidioc_enum_fmt_type_private(file, fh, arg);
        }
        return -EINVAL;
}

static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_format *p = arg;

        switch (p->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                if (unlikely(!ops->vidioc_g_fmt_vid_cap))
                        break;
                return ops->vidioc_g_fmt_vid_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                if (unlikely(!ops->vidioc_g_fmt_vid_cap_mplane))
                        break;
                return ops->vidioc_g_fmt_vid_cap_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
                if (unlikely(!ops->vidioc_g_fmt_vid_overlay))
                        break;
                return ops->vidioc_g_fmt_vid_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                if (unlikely(!ops->vidioc_g_fmt_vid_out))
                        break;
                return ops->vidioc_g_fmt_vid_out(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                if (unlikely(!ops->vidioc_g_fmt_vid_out_mplane))
                        break;
                return ops->vidioc_g_fmt_vid_out_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
                if (unlikely(!ops->vidioc_g_fmt_vid_out_overlay))
                        break;
                return ops->vidioc_g_fmt_vid_out_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_g_fmt_vbi_cap))
                        break;
                return ops->vidioc_g_fmt_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_g_fmt_vbi_out))
                        break;
                return ops->vidioc_g_fmt_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_g_fmt_sliced_vbi_cap))
                        break;
                return ops->vidioc_g_fmt_sliced_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_g_fmt_sliced_vbi_out))
                        break;
                return ops->vidioc_g_fmt_sliced_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_PRIVATE:
                if (unlikely(!ops->vidioc_g_fmt_type_private))
                        break;
                return ops->vidioc_g_fmt_type_private(file, fh, arg);
        }
        return -EINVAL;
}

static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_format *p = arg;

        switch (p->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                if (unlikely(!ops->vidioc_s_fmt_vid_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix);
                return ops->vidioc_s_fmt_vid_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                if (unlikely(!ops->vidioc_s_fmt_vid_cap_mplane))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix_mp);
                return ops->vidioc_s_fmt_vid_cap_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
                if (unlikely(!ops->vidioc_s_fmt_vid_overlay))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.win);
                return ops->vidioc_s_fmt_vid_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                if (unlikely(!ops->vidioc_s_fmt_vid_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix);
                return ops->vidioc_s_fmt_vid_out(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                if (unlikely(!ops->vidioc_s_fmt_vid_out_mplane))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix_mp);
                return ops->vidioc_s_fmt_vid_out_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
                if (unlikely(!ops->vidioc_s_fmt_vid_out_overlay))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.win);
                return ops->vidioc_s_fmt_vid_out_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_s_fmt_vbi_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.vbi);
                return ops->vidioc_s_fmt_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_s_fmt_vbi_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.vbi);
                return ops->vidioc_s_fmt_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_s_fmt_sliced_vbi_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.sliced);
                return ops->vidioc_s_fmt_sliced_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_s_fmt_sliced_vbi_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.sliced);
                return ops->vidioc_s_fmt_sliced_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_PRIVATE:
                if (unlikely(!ops->vidioc_s_fmt_type_private))
                        break;
                return ops->vidioc_s_fmt_type_private(file, fh, arg);
        }
        return -EINVAL;
}

static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_format *p = arg;

        switch (p->type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                if (unlikely(!ops->vidioc_try_fmt_vid_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix);
                return ops->vidioc_try_fmt_vid_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
                if (unlikely(!ops->vidioc_try_fmt_vid_cap_mplane))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix_mp);
                return ops->vidioc_try_fmt_vid_cap_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OVERLAY:
                if (unlikely(!ops->vidioc_try_fmt_vid_overlay))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.win);
                return ops->vidioc_try_fmt_vid_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
                if (unlikely(!ops->vidioc_try_fmt_vid_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix);
                return ops->vidioc_try_fmt_vid_out(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
                if (unlikely(!ops->vidioc_try_fmt_vid_out_mplane))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.pix_mp);
                return ops->vidioc_try_fmt_vid_out_mplane(file, fh, arg);
        case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
                if (unlikely(!ops->vidioc_try_fmt_vid_out_overlay))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.win);
                return ops->vidioc_try_fmt_vid_out_overlay(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_try_fmt_vbi_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.vbi);
                return ops->vidioc_try_fmt_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_try_fmt_vbi_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.vbi);
                return ops->vidioc_try_fmt_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
                if (unlikely(!ops->vidioc_try_fmt_sliced_vbi_cap))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.sliced);
                return ops->vidioc_try_fmt_sliced_vbi_cap(file, fh, arg);
        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
                if (unlikely(!ops->vidioc_try_fmt_sliced_vbi_out))
                        break;
                CLEAR_AFTER_FIELD(p, fmt.sliced);
                return ops->vidioc_try_fmt_sliced_vbi_out(file, fh, arg);
        case V4L2_BUF_TYPE_PRIVATE:
                if (unlikely(!ops->vidioc_try_fmt_type_private))
                        break;
                return ops->vidioc_try_fmt_type_private(file, fh, arg);
        }
        return -EINVAL;
}

static int v4l_streamon(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_streamon(file, fh, *(unsigned int *)arg);
}

static int v4l_streamoff(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_streamoff(file, fh, *(unsigned int *)arg);
}

static int v4l_g_tuner(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_tuner *p = arg;
        int err;

        p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                        V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
        err = ops->vidioc_g_tuner(file, fh, p);
        if (!err)
                p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
        return err;
}

static int v4l_s_tuner(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_tuner *p = arg;

        p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                        V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
        return ops->vidioc_s_tuner(file, fh, p);
}

static int v4l_g_modulator(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_modulator *p = arg;
        int err;

        err = ops->vidioc_g_modulator(file, fh, p);
        if (!err)
                p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
        return err;
}

static int v4l_g_frequency(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_frequency *p = arg;

        p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                        V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
        return ops->vidioc_g_frequency(file, fh, p);
}

static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_frequency *p = arg;
        enum v4l2_tuner_type type;

        type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                        V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
        if (p->type != type)
                return -EINVAL;
        return ops->vidioc_s_frequency(file, fh, p);
}

static int v4l_enumstd(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_standard *p = arg;
        v4l2_std_id id = vfd->tvnorms, curr_id = 0;
        unsigned int index = p->index, i, j = 0;
        const char *descr = "";

        /* Return norm array in a canonical way */
        for (i = 0; i <= index && id; i++) {
                /* last std value in the standards array is 0, so this
                   while always ends there since (id & 0) == 0. */
                while ((id & standards[j].std) != standards[j].std)
                        j++;
                curr_id = standards[j].std;
                descr = standards[j].descr;
                j++;
                if (curr_id == 0)
                        break;
                if (curr_id != V4L2_STD_PAL &&
                                curr_id != V4L2_STD_SECAM &&
                                curr_id != V4L2_STD_NTSC)
                        id &= ~curr_id;
        }
        if (i <= index)
                return -EINVAL;

        v4l2_video_std_construct(p, curr_id, descr);
        return 0;
}

static int v4l_g_std(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        v4l2_std_id *id = arg;

        /* Calls the specific handler */
        if (ops->vidioc_g_std)
                return ops->vidioc_g_std(file, fh, arg);
        if (vfd->current_norm) {
                *id = vfd->current_norm;
                return 0;
        }
        return -ENOTTY;
}

static int v4l_s_std(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        v4l2_std_id *id = arg, norm;
        int ret;

        norm = (*id) & vfd->tvnorms;
        if (vfd->tvnorms && !norm)      /* Check if std is supported */
                return -EINVAL;

        /* Calls the specific handler */
        ret = ops->vidioc_s_std(file, fh, &norm);

        /* Updates standard information */
        if (ret >= 0)
                vfd->current_norm = norm;
        return ret;
}

static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        v4l2_std_id *p = arg;

        /*
         * If nothing detected, it should return all supported
         * standard.
         * Drivers just need to mask the std argument, in order
         * to remove the standards that don't apply from the mask.
         * This means that tuners, audio and video decoders can join
         * their efforts to improve the standards detection.
         */
        *p = vfd->tvnorms;
        return ops->vidioc_querystd(file, fh, arg);
}

static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_hw_freq_seek *p = arg;
        enum v4l2_tuner_type type;

        type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
        if (p->type != type)
                return -EINVAL;
        return ops->vidioc_s_hw_freq_seek(file, fh, p);
}

static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_requestbuffers *p = arg;
        int ret = check_fmt(ops, p->type);

        if (ret)
                return ret;

        if (p->type < V4L2_BUF_TYPE_PRIVATE)
                CLEAR_AFTER_FIELD(p, memory);

        return ops->vidioc_reqbufs(file, fh, p);
}

static int v4l_querybuf(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_buffer *p = arg;
        int ret = check_fmt(ops, p->type);

        return ret ? ret : ops->vidioc_querybuf(file, fh, p);
}

static int v4l_qbuf(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_buffer *p = arg;
        int ret = check_fmt(ops, p->type);

        return ret ? ret : ops->vidioc_qbuf(file, fh, p);
}

static int v4l_dqbuf(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_buffer *p = arg;
        int ret = check_fmt(ops, p->type);

        return ret ? ret : ops->vidioc_dqbuf(file, fh, p);
}

static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_create_buffers *create = arg;
        int ret = check_fmt(ops, create->format.type);

        return ret ? ret : ops->vidioc_create_bufs(file, fh, create);
}

static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_buffer *b = arg;
        int ret = check_fmt(ops, b->type);

        return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
}

static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_streamparm *p = arg;
        v4l2_std_id std;
        int ret = check_fmt(ops, p->type);

        if (ret)
                return ret;
        if (ops->vidioc_g_parm)
                return ops->vidioc_g_parm(file, fh, p);
        std = vfd->current_norm;
        if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
            p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
                return -EINVAL;
        p->parm.capture.readbuffers = 2;
        if (ops->vidioc_g_std)
                ret = ops->vidioc_g_std(file, fh, &std);
        if (ret == 0)
                v4l2_video_std_frame_period(std,
                            &p->parm.capture.timeperframe);
        return ret;
}

static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_streamparm *p = arg;
        int ret = check_fmt(ops, p->type);

        return ret ? ret : ops->vidioc_s_parm(file, fh, p);
}

static int v4l_queryctrl(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_queryctrl *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;

        if (vfh && vfh->ctrl_handler)
                return v4l2_queryctrl(vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_queryctrl(vfd->ctrl_handler, p);
        if (ops->vidioc_queryctrl)
                return ops->vidioc_queryctrl(file, fh, p);
        return -ENOTTY;
}

static int v4l_querymenu(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_querymenu *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;

        if (vfh && vfh->ctrl_handler)
                return v4l2_querymenu(vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_querymenu(vfd->ctrl_handler, p);
        if (ops->vidioc_querymenu)
                return ops->vidioc_querymenu(file, fh, p);
        return -ENOTTY;
}

static int v4l_g_ctrl(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_control *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
        struct v4l2_ext_controls ctrls;
        struct v4l2_ext_control ctrl;

        if (vfh && vfh->ctrl_handler)
                return v4l2_g_ctrl(vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_g_ctrl(vfd->ctrl_handler, p);
        if (ops->vidioc_g_ctrl)
                return ops->vidioc_g_ctrl(file, fh, p);
        if (ops->vidioc_g_ext_ctrls == NULL)
                return -ENOTTY;

        ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
        ctrls.count = 1;
        ctrls.controls = &ctrl;
        ctrl.id = p->id;
        ctrl.value = p->value;
        if (check_ext_ctrls(&ctrls, 1)) {
                int ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);

                if (ret == 0)
                        p->value = ctrl.value;
                return ret;
        }
        return -EINVAL;
}

static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_control *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
        struct v4l2_ext_controls ctrls;
        struct v4l2_ext_control ctrl;

        if (vfh && vfh->ctrl_handler)
                return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);
        if (ops->vidioc_s_ctrl)
                return ops->vidioc_s_ctrl(file, fh, p);
        if (ops->vidioc_s_ext_ctrls == NULL)
                return -ENOTTY;

        ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
        ctrls.count = 1;
        ctrls.controls = &ctrl;
        ctrl.id = p->id;
        ctrl.value = p->value;
        if (check_ext_ctrls(&ctrls, 1))
                return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
        return -EINVAL;
}

static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_ext_controls *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;

        p->error_idx = p->count;
        if (vfh && vfh->ctrl_handler)
                return v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
        if (ops->vidioc_g_ext_ctrls == NULL)
                return -ENOTTY;
        return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
                                        -EINVAL;
}

static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_ext_controls *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;

        p->error_idx = p->count;
        if (vfh && vfh->ctrl_handler)
                return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
        if (ops->vidioc_s_ext_ctrls == NULL)
                return -ENOTTY;
        return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
                                        -EINVAL;
}

static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_ext_controls *p = arg;
        struct v4l2_fh *vfh =
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;

        p->error_idx = p->count;
        if (vfh && vfh->ctrl_handler)
                return v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
        if (vfd->ctrl_handler)
                return v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
        if (ops->vidioc_try_ext_ctrls == NULL)
                return -ENOTTY;
        return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
                                        -EINVAL;
}

static int v4l_g_crop(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_crop *p = arg;
        struct v4l2_selection s = {
                .type = p->type,
        };
        int ret;

        if (ops->vidioc_g_crop)
                return ops->vidioc_g_crop(file, fh, p);
        /* simulate capture crop using selection api */

        /* crop means compose for output devices */
        if (V4L2_TYPE_IS_OUTPUT(p->type))
                s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
        else
                s.target = V4L2_SEL_TGT_CROP_ACTIVE;

        ret = ops->vidioc_g_selection(file, fh, &s);

        /* copying results to old structure on success */
        if (!ret)
                p->c = s.r;
        return ret;
}

static int v4l_s_crop(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_crop *p = arg;
        struct v4l2_selection s = {
                .type = p->type,
                .r = p->c,
        };

        if (ops->vidioc_s_crop)
                return ops->vidioc_s_crop(file, fh, p);
        /* simulate capture crop using selection api */

        /* crop means compose for output devices */
        if (V4L2_TYPE_IS_OUTPUT(p->type))
                s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
        else
                s.target = V4L2_SEL_TGT_CROP_ACTIVE;

        return ops->vidioc_s_selection(file, fh, &s);
}

static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_cropcap *p = arg;
        struct v4l2_selection s = { .type = p->type };
        int ret;

        if (ops->vidioc_cropcap)
                return ops->vidioc_cropcap(file, fh, p);

        /* obtaining bounds */
        if (V4L2_TYPE_IS_OUTPUT(p->type))
                s.target = V4L2_SEL_TGT_COMPOSE_BOUNDS;
        else
                s.target = V4L2_SEL_TGT_CROP_BOUNDS;

        ret = ops->vidioc_g_selection(file, fh, &s);
        if (ret)
                return ret;
        p->bounds = s.r;

        /* obtaining defrect */
        if (V4L2_TYPE_IS_OUTPUT(p->type))
                s.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
        else
                s.target = V4L2_SEL_TGT_CROP_DEFAULT;

        ret = ops->vidioc_g_selection(file, fh, &s);
        if (ret)
                return ret;
        p->defrect = s.r;

        /* setting trivial pixelaspect */
        p->pixelaspect.numerator = 1;
        p->pixelaspect.denominator = 1;
        return 0;
}

static int v4l_log_status(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        int ret;

        if (vfd->v4l2_dev)
                pr_info("%s: =================  START STATUS  =================\n",
                        vfd->v4l2_dev->name);
        ret = ops->vidioc_log_status(file, fh);
        if (vfd->v4l2_dev)
                pr_info("%s: ==================  END STATUS  ==================\n",
                        vfd->v4l2_dev->name);
        return ret;
}

static int v4l_dbg_g_register(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
#ifdef CONFIG_VIDEO_ADV_DEBUG
        struct v4l2_dbg_register *p = arg;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        return ops->vidioc_g_register(file, fh, p);
#else
        return -ENOTTY;
#endif
}

static int v4l_dbg_s_register(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
#ifdef CONFIG_VIDEO_ADV_DEBUG
        struct v4l2_dbg_register *p = arg;

        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        return ops->vidioc_s_register(file, fh, p);
#else
        return -ENOTTY;
#endif
}

static int v4l_dbg_g_chip_ident(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_dbg_chip_ident *p = arg;

        p->ident = V4L2_IDENT_NONE;
        p->revision = 0;
        return ops->vidioc_g_chip_ident(file, fh, p);
}

static int v4l_dqevent(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
}

static int v4l_subscribe_event(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_subscribe_event(fh, arg);
}

static int v4l_unsubscribe_event(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        return ops->vidioc_unsubscribe_event(fh, arg);
}

static int v4l_g_sliced_vbi_cap(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct v4l2_sliced_vbi_cap *p = arg;

        /* Clear up to type, everything after type is zeroed already */
        memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));

        return ops->vidioc_g_sliced_vbi_cap(file, fh, p);
}

static int v4l_enum_freq_bands(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        struct v4l2_frequency_band *p = arg;
        enum v4l2_tuner_type type;
        int err;

        type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
                        V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;

        if (type != p->type)
                return -EINVAL;
        if (ops->vidioc_enum_freq_bands)
                return ops->vidioc_enum_freq_bands(file, fh, p);
        if (ops->vidioc_g_tuner) {
                struct v4l2_tuner t = {
                        .index = p->tuner,
                        .type = type,
                };

                if (p->index)
                        return -EINVAL;
                err = ops->vidioc_g_tuner(file, fh, &t);
                if (err)
                        return err;
                p->capability = t.capability | V4L2_TUNER_CAP_FREQ_BANDS;
                p->rangelow = t.rangelow;
                p->rangehigh = t.rangehigh;
                p->modulation = (type == V4L2_TUNER_RADIO) ?
                        V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
                return 0;
        }
        if (ops->vidioc_g_modulator) {
                struct v4l2_modulator m = {
                        .index = p->tuner,
                };

                if (type != V4L2_TUNER_RADIO)
                        return -EINVAL;
                if (p->index)
                        return -EINVAL;
                err = ops->vidioc_g_modulator(file, fh, &m);
                if (err)
                        return err;
                p->capability = m.capability | V4L2_TUNER_CAP_FREQ_BANDS;
                p->rangelow = m.rangelow;
                p->rangehigh = m.rangehigh;
                p->modulation = (type == V4L2_TUNER_RADIO) ?
                        V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
                return 0;
        }
        return -ENOTTY;
}

struct v4l2_ioctl_info {
        unsigned int ioctl;
        u32 flags;
        const char * const name;
        union {
                u32 offset;
                int (*func)(const struct v4l2_ioctl_ops *ops,
                                struct file *file, void *fh, void *p);
        } u;
        void (*debug)(const void *arg, bool write_only);
};

/* This control needs a priority check */
#define INFO_FL_PRIO    (1 << 0)
/* This control can be valid if the filehandle passes a control handler. */
#define INFO_FL_CTRL    (1 << 1)
/* This is a standard ioctl, no need for special code */
#define INFO_FL_STD     (1 << 2)
/* This is ioctl has its own function */
#define INFO_FL_FUNC    (1 << 3)
/* Queuing ioctl */
#define INFO_FL_QUEUE   (1 << 4)
/* Zero struct from after the field to the end */
#define INFO_FL_CLEAR(v4l2_struct, field)                       \
        ((offsetof(struct v4l2_struct, field) +                 \
          sizeof(((struct v4l2_struct *)0)->field)) << 16)
#define INFO_FL_CLEAR_MASK (_IOC_SIZEMASK << 16)

#define IOCTL_INFO_STD(_ioctl, _vidioc, _debug, _flags)                 \
        [_IOC_NR(_ioctl)] = {                                           \
                .ioctl = _ioctl,                                        \
                .flags = _flags | INFO_FL_STD,                          \
                .name = #_ioctl,                                        \
                .u.offset = offsetof(struct v4l2_ioctl_ops, _vidioc),   \
                .debug = _debug,                                        \
        }

#define IOCTL_INFO_FNC(_ioctl, _func, _debug, _flags)                   \
        [_IOC_NR(_ioctl)] = {                                           \
                .ioctl = _ioctl,                                        \
                .flags = _flags | INFO_FL_FUNC,                         \
                .name = #_ioctl,                                        \
                .u.func = _func,                                        \
                .debug = _debug,                                        \
        }

static struct v4l2_ioctl_info v4l2_ioctls[] = {
        IOCTL_INFO_FNC(VIDIOC_QUERYCAP, v4l_querycap, v4l_print_querycap, 0),
        IOCTL_INFO_FNC(VIDIOC_ENUM_FMT, v4l_enum_fmt, v4l_print_fmtdesc, INFO_FL_CLEAR(v4l2_fmtdesc, type)),
        IOCTL_INFO_FNC(VIDIOC_G_FMT, v4l_g_fmt, v4l_print_format, INFO_FL_CLEAR(v4l2_format, type)),
        IOCTL_INFO_FNC(VIDIOC_S_FMT, v4l_s_fmt, v4l_print_format, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_REQBUFS, v4l_reqbufs, v4l_print_requestbuffers, INFO_FL_PRIO | INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_QUERYBUF, v4l_querybuf, v4l_print_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
        IOCTL_INFO_STD(VIDIOC_G_FBUF, vidioc_g_fbuf, v4l_print_framebuffer, 0),
        IOCTL_INFO_STD(VIDIOC_S_FBUF, vidioc_s_fbuf, v4l_print_framebuffer, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_OVERLAY, vidioc_overlay, v4l_print_u32, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_QBUF, v4l_qbuf, v4l_print_buffer, INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_DQBUF, v4l_dqbuf, v4l_print_buffer, INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_STREAMON, v4l_streamon, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_STREAMOFF, v4l_streamoff, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),
        IOCTL_INFO_FNC(VIDIOC_S_PARM, v4l_s_parm, v4l_print_streamparm, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_G_STD, v4l_g_std, v4l_print_std, 0),
        IOCTL_INFO_FNC(VIDIOC_S_STD, v4l_s_std, v4l_print_std, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_ENUMSTD, v4l_enumstd, v4l_print_standard, INFO_FL_CLEAR(v4l2_standard, index)),
        IOCTL_INFO_FNC(VIDIOC_ENUMINPUT, v4l_enuminput, v4l_print_enuminput, INFO_FL_CLEAR(v4l2_input, index)),
        IOCTL_INFO_FNC(VIDIOC_G_CTRL, v4l_g_ctrl, v4l_print_control, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_control, id)),
        IOCTL_INFO_FNC(VIDIOC_S_CTRL, v4l_s_ctrl, v4l_print_control, INFO_FL_PRIO | INFO_FL_CTRL),
        IOCTL_INFO_FNC(VIDIOC_G_TUNER, v4l_g_tuner, v4l_print_tuner, INFO_FL_CLEAR(v4l2_tuner, index)),
        IOCTL_INFO_FNC(VIDIOC_S_TUNER, v4l_s_tuner, v4l_print_tuner, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_AUDIO, vidioc_g_audio, v4l_print_audio, 0),
        IOCTL_INFO_STD(VIDIOC_S_AUDIO, vidioc_s_audio, v4l_print_audio, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_QUERYCTRL, v4l_queryctrl, v4l_print_queryctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_queryctrl, id)),
        IOCTL_INFO_FNC(VIDIOC_QUERYMENU, v4l_querymenu, v4l_print_querymenu, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_querymenu, index)),
        IOCTL_INFO_STD(VIDIOC_G_INPUT, vidioc_g_input, v4l_print_u32, 0),
        IOCTL_INFO_FNC(VIDIOC_S_INPUT, v4l_s_input, v4l_print_u32, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_OUTPUT, vidioc_g_output, v4l_print_u32, 0),
        IOCTL_INFO_FNC(VIDIOC_S_OUTPUT, v4l_s_output, v4l_print_u32, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_ENUMOUTPUT, v4l_enumoutput, v4l_print_enumoutput, INFO_FL_CLEAR(v4l2_output, index)),
        IOCTL_INFO_STD(VIDIOC_G_AUDOUT, vidioc_g_audout, v4l_print_audioout, 0),
        IOCTL_INFO_STD(VIDIOC_S_AUDOUT, vidioc_s_audout, v4l_print_audioout, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_G_MODULATOR, v4l_g_modulator, v4l_print_modulator, INFO_FL_CLEAR(v4l2_modulator, index)),
        IOCTL_INFO_STD(VIDIOC_S_MODULATOR, vidioc_s_modulator, v4l_print_modulator, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_G_FREQUENCY, v4l_g_frequency, v4l_print_frequency, INFO_FL_CLEAR(v4l2_frequency, tuner)),
        IOCTL_INFO_FNC(VIDIOC_S_FREQUENCY, v4l_s_frequency, v4l_print_frequency, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_CROPCAP, v4l_cropcap, v4l_print_cropcap, INFO_FL_CLEAR(v4l2_cropcap, type)),
        IOCTL_INFO_FNC(VIDIOC_G_CROP, v4l_g_crop, v4l_print_crop, INFO_FL_CLEAR(v4l2_crop, type)),
        IOCTL_INFO_FNC(VIDIOC_S_CROP, v4l_s_crop, v4l_print_crop, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_SELECTION, vidioc_g_selection, v4l_print_selection, 0),
        IOCTL_INFO_STD(VIDIOC_S_SELECTION, vidioc_s_selection, v4l_print_selection, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp, v4l_print_jpegcompression, 0),
        IOCTL_INFO_STD(VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp, v4l_print_jpegcompression, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_QUERYSTD, v4l_querystd, v4l_print_std, 0),
        IOCTL_INFO_FNC(VIDIOC_TRY_FMT, v4l_try_fmt, v4l_print_format, 0),
        IOCTL_INFO_STD(VIDIOC_ENUMAUDIO, vidioc_enumaudio, v4l_print_audio, INFO_FL_CLEAR(v4l2_audio, index)),
        IOCTL_INFO_STD(VIDIOC_ENUMAUDOUT, vidioc_enumaudout, v4l_print_audioout, INFO_FL_CLEAR(v4l2_audioout, index)),
        IOCTL_INFO_FNC(VIDIOC_G_PRIORITY, v4l_g_priority, v4l_print_u32, 0),
        IOCTL_INFO_FNC(VIDIOC_S_PRIORITY, v4l_s_priority, v4l_print_u32, INFO_FL_PRIO),
        IOCTL_INFO_FNC(VIDIOC_G_SLICED_VBI_CAP, v4l_g_sliced_vbi_cap, v4l_print_sliced_vbi_cap, INFO_FL_CLEAR(v4l2_sliced_vbi_cap, type)),
        IOCTL_INFO_FNC(VIDIOC_LOG_STATUS, v4l_log_status, v4l_print_newline, 0),
        IOCTL_INFO_FNC(VIDIOC_G_EXT_CTRLS, v4l_g_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
        IOCTL_INFO_FNC(VIDIOC_S_EXT_CTRLS, v4l_s_ext_ctrls, v4l_print_ext_controls, INFO_FL_PRIO | INFO_FL_CTRL),
        IOCTL_INFO_FNC(VIDIOC_TRY_EXT_CTRLS, v4l_try_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
        IOCTL_INFO_STD(VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes, v4l_print_frmsizeenum, INFO_FL_CLEAR(v4l2_frmsizeenum, pixel_format)),
        IOCTL_INFO_STD(VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals, v4l_print_frmivalenum, INFO_FL_CLEAR(v4l2_frmivalenum, height)),
        IOCTL_INFO_STD(VIDIOC_G_ENC_INDEX, vidioc_g_enc_index, v4l_print_enc_idx, 0),
        IOCTL_INFO_STD(VIDIOC_ENCODER_CMD, vidioc_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_PRIO | INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
        IOCTL_INFO_STD(VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
        IOCTL_INFO_STD(VIDIOC_DECODER_CMD, vidioc_decoder_cmd, v4l_print_decoder_cmd, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd, v4l_print_decoder_cmd, 0),
        IOCTL_INFO_FNC(VIDIOC_DBG_S_REGISTER, v4l_dbg_s_register, v4l_print_dbg_register, 0),
        IOCTL_INFO_FNC(VIDIOC_DBG_G_REGISTER, v4l_dbg_g_register, v4l_print_dbg_register, 0),
        IOCTL_INFO_FNC(VIDIOC_DBG_G_CHIP_IDENT, v4l_dbg_g_chip_ident, v4l_print_dbg_chip_ident, 0),
        IOCTL_INFO_FNC(VIDIOC_S_HW_FREQ_SEEK, v4l_s_hw_freq_seek, v4l_print_hw_freq_seek, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets, v4l_print_dv_enum_presets, 0),
        IOCTL_INFO_STD(VIDIOC_S_DV_PRESET, vidioc_s_dv_preset, v4l_print_dv_preset, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_DV_PRESET, vidioc_g_dv_preset, v4l_print_dv_preset, 0),
        IOCTL_INFO_STD(VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset, v4l_print_dv_preset, 0),
        IOCTL_INFO_STD(VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings, v4l_print_dv_timings, INFO_FL_PRIO),
        IOCTL_INFO_STD(VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings, v4l_print_dv_timings, 0),
        IOCTL_INFO_FNC(VIDIOC_DQEVENT, v4l_dqevent, v4l_print_event, 0),
        IOCTL_INFO_FNC(VIDIOC_SUBSCRIBE_EVENT, v4l_subscribe_event, v4l_print_event_subscription, 0),
        IOCTL_INFO_FNC(VIDIOC_UNSUBSCRIBE_EVENT, v4l_unsubscribe_event, v4l_print_event_subscription, 0),
        IOCTL_INFO_FNC(VIDIOC_CREATE_BUFS, v4l_create_bufs, v4l_print_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
        IOCTL_INFO_FNC(VIDIOC_PREPARE_BUF, v4l_prepare_buf, v4l_print_buffer, INFO_FL_QUEUE),
        IOCTL_INFO_STD(VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings, v4l_print_enum_dv_timings, 0),
        IOCTL_INFO_STD(VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings, v4l_print_dv_timings, 0),
        IOCTL_INFO_STD(VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap, v4l_print_dv_timings_cap, INFO_FL_CLEAR(v4l2_dv_timings_cap, type)),
        IOCTL_INFO_FNC(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0),
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)

bool v4l2_is_known_ioctl(unsigned int cmd)
{
        if (_IOC_NR(cmd) >= V4L2_IOCTLS)
                return false;
        return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
}

struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev, unsigned cmd)
{
        if (_IOC_NR(cmd) >= V4L2_IOCTLS)
                return vdev->lock;
        if (test_bit(_IOC_NR(cmd), vdev->disable_locking))
                return NULL;
        if (vdev->queue && vdev->queue->lock &&
                        (v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE))
                return vdev->queue->lock;
        return vdev->lock;
}

/* Common ioctl debug function. This function can be used by
   external ioctl messages as well as internal V4L ioctl */
void v4l_printk_ioctl(const char *prefix, unsigned int cmd)
{
        const char *dir, *type;

        if (prefix)
                printk(KERN_DEBUG "%s: ", prefix);

        switch (_IOC_TYPE(cmd)) {
        case 'd':
                type = "v4l2_int";
                break;
        case 'V':
                if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
                        type = "v4l2";
                        break;
                }
                pr_cont("%s", v4l2_ioctls[_IOC_NR(cmd)].name);
                return;
        default:
                type = "unknown";
                break;
        }

        switch (_IOC_DIR(cmd)) {
        case _IOC_NONE:              dir = "--"; break;
        case _IOC_READ:              dir = "r-"; break;
        case _IOC_WRITE:             dir = "-w"; break;
        case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
        default:                     dir = "*ERR*"; break;
        }
        pr_cont("%s ioctl '%c', dir=%s, #%d (0x%08x)",
                type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
}
EXPORT_SYMBOL(v4l_printk_ioctl);

static long __video_do_ioctl(struct file *file,
                unsigned int cmd, void *arg)
{
        struct video_device *vfd = video_devdata(file);
        const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
        bool write_only = false;
        struct v4l2_ioctl_info default_info;
        const struct v4l2_ioctl_info *info;
        void *fh = file->private_data;
        struct v4l2_fh *vfh = NULL;
        int use_fh_prio = 0;
        int debug = vfd->debug;
        long ret = -ENOTTY;

        if (ops == NULL) {
                pr_warn("%s: has no ioctl_ops.\n",
                                video_device_node_name(vfd));
                return ret;
        }

        if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
                vfh = file->private_data;
                use_fh_prio = test_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
        }

        if (v4l2_is_known_ioctl(cmd)) {
                info = &v4l2_ioctls[_IOC_NR(cmd)];

                if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
                    !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
                        goto done;

                if (use_fh_prio && (info->flags & INFO_FL_PRIO)) {
                        ret = v4l2_prio_check(vfd->prio, vfh->prio);
                        if (ret)
                                goto done;
                }
        } else {
                default_info.ioctl = cmd;
                default_info.flags = 0;
                default_info.debug = v4l_print_default;
                info = &default_info;
        }

        write_only = _IOC_DIR(cmd) == _IOC_WRITE;
        if (write_only && debug > V4L2_DEBUG_IOCTL) {
                v4l_printk_ioctl(video_device_node_name(vfd), cmd);
                pr_cont(": ");
                info->debug(arg, write_only);
        }
        if (info->flags & INFO_FL_STD) {
                typedef int (*vidioc_op)(struct file *file, void *fh, void *p);
                const void *p = vfd->ioctl_ops;
                const vidioc_op *vidioc = p + info->u.offset;

                ret = (*vidioc)(file, fh, arg);
        } else if (info->flags & INFO_FL_FUNC) {
                ret = info->u.func(ops, file, fh, arg);
        } else if (!ops->vidioc_default) {
                ret = -ENOTTY;
        } else {
                ret = ops->vidioc_default(file, fh,
                        use_fh_prio ? v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
                        cmd, arg);
        }

done:
        if (debug) {
                if (write_only && debug > V4L2_DEBUG_IOCTL) {
                        if (ret < 0)
                                printk(KERN_DEBUG "%s: error %ld\n",
                                        video_device_node_name(vfd), ret);
                        return ret;
                }
                v4l_printk_ioctl(video_device_node_name(vfd), cmd);
                if (ret < 0)
                        pr_cont(": error %ld\n", ret);
                else if (debug == V4L2_DEBUG_IOCTL)
                        pr_cont("\n");
                else if (_IOC_DIR(cmd) == _IOC_NONE)
                        info->debug(arg, write_only);
                else {
                        pr_cont(": ");
                        info->debug(arg, write_only);
                }
        }

        return ret;
}

static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
                            void * __user *user_ptr, void ***kernel_ptr)
{
        int ret = 0;

        switch (cmd) {
        case VIDIOC_QUERYBUF:
        case VIDIOC_QBUF:
        case VIDIOC_DQBUF: {
                struct v4l2_buffer *buf = parg;

                if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
                        if (buf->length > VIDEO_MAX_PLANES) {
                                ret = -EINVAL;
                                break;
                        }
                        *user_ptr = (void __user *)buf->m.planes;
                        *kernel_ptr = (void *)&buf->m.planes;
                        *array_size = sizeof(struct v4l2_plane) * buf->length;
                        ret = 1;
                }
                break;
        }

        case VIDIOC_S_EXT_CTRLS:
        case VIDIOC_G_EXT_CTRLS:
        case VIDIOC_TRY_EXT_CTRLS: {
                struct v4l2_ext_controls *ctrls = parg;

                if (ctrls->count != 0) {
                        if (ctrls->count > V4L2_CID_MAX_CTRLS) {
                                ret = -EINVAL;
                                break;
                        }
                        *user_ptr = (void __user *)ctrls->controls;
                        *kernel_ptr = (void *)&ctrls->controls;
                        *array_size = sizeof(struct v4l2_ext_control)
                                    * ctrls->count;
                        ret = 1;
                }
                break;
        }
        }

        return ret;
}

long
video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
               v4l2_kioctl func)
{
        char    sbuf[128];
        void    *mbuf = NULL;
        void    *parg = (void *)arg;
        long    err  = -EINVAL;
        bool    has_array_args;
        size_t  array_size = 0;
        void __user *user_ptr = NULL;
        void    **kernel_ptr = NULL;

        /*  Copy arguments into temp kernel buffer  */
        if (_IOC_DIR(cmd) != _IOC_NONE) {
                if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
                        parg = sbuf;
                } else {
                        /* too big to allocate from stack */
                        mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
                        if (NULL == mbuf)
                                return -ENOMEM;
                        parg = mbuf;
                }

                err = -EFAULT;
                if (_IOC_DIR(cmd) & _IOC_WRITE) {
                        unsigned int n = _IOC_SIZE(cmd);

                        /*
                         * In some cases, only a few fields are used as input,
                         * i.e. when the app sets "index" and then the driver
                         * fills in the rest of the structure for the thing
                         * with that index.  We only need to copy up the first
                         * non-input field.
                         */
                        if (v4l2_is_known_ioctl(cmd)) {
                                u32 flags = v4l2_ioctls[_IOC_NR(cmd)].flags;
                                if (flags & INFO_FL_CLEAR_MASK)
                                        n = (flags & INFO_FL_CLEAR_MASK) >> 16;
                        }

                        if (copy_from_user(parg, (void __user *)arg, n))
                                goto out;

                        /* zero out anything we don't copy from userspace */
                        if (n < _IOC_SIZE(cmd))
                                memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
                } else {
                        /* read-only ioctl */
                        memset(parg, 0, _IOC_SIZE(cmd));
                }
        }

        err = check_array_args(cmd, parg, &array_size, &user_ptr, &kernel_ptr);
        if (err < 0)
                goto out;
        has_array_args = err;

        if (has_array_args) {
                /*
                 * When adding new types of array args, make sure that the
                 * parent argument to ioctl (which contains the pointer to the
                 * array) fits into sbuf (so that mbuf will still remain
                 * unused up to here).
                 */
                mbuf = kmalloc(array_size, GFP_KERNEL);
                err = -ENOMEM;
                if (NULL == mbuf)
                        goto out_array_args;
                err = -EFAULT;
                if (copy_from_user(mbuf, user_ptr, array_size))
                        goto out_array_args;
                *kernel_ptr = mbuf;
        }

        /* Handles IOCTL */
        err = func(file, cmd, parg);
        if (err == -ENOIOCTLCMD)
                err = -ENOTTY;

        if (has_array_args) {
                *kernel_ptr = user_ptr;
                if (copy_to_user(user_ptr, mbuf, array_size))
                        err = -EFAULT;
                goto out_array_args;
        }
        /* VIDIOC_QUERY_DV_TIMINGS can return an error, but still have valid
           results that must be returned. */
        if (err < 0 && cmd != VIDIOC_QUERY_DV_TIMINGS)
                goto out;

out_array_args:
        /*  Copy results into user buffer  */
        switch (_IOC_DIR(cmd)) {
        case _IOC_READ:
        case (_IOC_WRITE | _IOC_READ):
                if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
                        err = -EFAULT;
                break;
        }

out:
        kfree(mbuf);
        return err;
}
EXPORT_SYMBOL(video_usercopy);

long video_ioctl2(struct file *file,
               unsigned int cmd, unsigned long arg)
{
        return video_usercopy(file, cmd, arg, __video_do_ioctl);
}
EXPORT_SYMBOL(video_ioctl2);