// SPDX-License-Identifier: GPL-2.0+
//
// DVB USB compliant linux driver for Conexant USB reference design -
// (analog part).
//
// Copyright (C) 2011, 2017, 2018
//      Maciej S. Szmigiero (mail@maciej.szmigiero.name)
//
// In case there are new analog / DVB-T hybrid devices released in the market
// using the same general design as Medion MD95700: a CX25840 video decoder
// outputting a BT.656 stream to a USB bridge chip which then forwards it to
// the host in isochronous USB packets this code should be made generic, with
// board specific bits implemented via separate card structures.
//
// This is, however, unlikely as the Medion model was released
// years ago (in 2005).
//
// TODO:
//  * audio support,
//  * finish radio support (requires audio of course),
//  * VBI support,
//  * controls support

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/ktime.h>
#include <linux/vmalloc.h>
#include <media/drv-intf/cx25840.h>
#include <media/tuner.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-subdev.h>
#include <media/videobuf2-vmalloc.h>

#include "cxusb.h"

static int cxusb_medion_v_queue_setup(struct vb2_queue *q,
                                      unsigned int *num_buffers,
                                      unsigned int *num_planes,
                                      unsigned int sizes[],
                                      struct device *alloc_devs[])
{
        struct dvb_usb_device *dvbdev = vb2_get_drv_priv(q);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        unsigned int size = cxdev->width * cxdev->height * 2;

        if (*num_planes > 0) {
                if (*num_planes != 1)
                        return -EINVAL;

                if (sizes[0] < size)
                        return -EINVAL;
        } else {
                *num_planes = 1;
                sizes[0] = size;
        }

        return 0;
}

static int cxusb_medion_v_buf_init(struct vb2_buffer *vb)
{
        struct dvb_usb_device *dvbdev = vb2_get_drv_priv(vb->vb2_queue);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        cxusb_vprintk(dvbdev, OPS, "buffer init\n");

        if (vb2_plane_size(vb, 0) < cxdev->width * cxdev->height * 2)
                return -ENOMEM;

        cxusb_vprintk(dvbdev, OPS, "buffer OK\n");

        return 0;
}

static void cxusb_auxbuf_init(struct dvb_usb_device *dvbdev,
                              struct cxusb_medion_auxbuf *auxbuf,
                              u8 *buf, unsigned int len)
{
        cxusb_vprintk(dvbdev, AUXB, "initializing auxbuf of len %u\n", len);

        auxbuf->buf = buf;
        auxbuf->len = len;
        auxbuf->paylen = 0;
}

static void cxusb_auxbuf_head_trim(struct dvb_usb_device *dvbdev,
                                   struct cxusb_medion_auxbuf *auxbuf,
                                   unsigned int pos)
{
        if (pos == 0)
                return;

        if (WARN_ON(pos > auxbuf->paylen))
                return;

        cxusb_vprintk(dvbdev, AUXB,
                      "trimming auxbuf len by %u to %u\n",
                      pos, auxbuf->paylen - pos);

        memmove(auxbuf->buf, auxbuf->buf + pos, auxbuf->paylen - pos);
        auxbuf->paylen -= pos;
}

static unsigned int cxusb_auxbuf_paylen(struct cxusb_medion_auxbuf *auxbuf)
{
        return auxbuf->paylen;
}

static bool cxusb_auxbuf_make_space(struct dvb_usb_device *dvbdev,
                                    struct cxusb_medion_auxbuf *auxbuf,
                                    unsigned int howmuch)
{
        unsigned int freespace;

        if (WARN_ON(howmuch >= auxbuf->len))
                howmuch = auxbuf->len - 1;

        freespace = auxbuf->len - cxusb_auxbuf_paylen(auxbuf);

        cxusb_vprintk(dvbdev, AUXB, "freespace is %u\n", freespace);

        if (freespace >= howmuch)
                return true;

        howmuch -= freespace;

        cxusb_vprintk(dvbdev, AUXB, "will overwrite %u bytes of buffer\n",
                      howmuch);

        cxusb_auxbuf_head_trim(dvbdev, auxbuf, howmuch);

        return false;
}

/* returns false if some data was overwritten */
static bool cxusb_auxbuf_append_urb(struct dvb_usb_device *dvbdev,
                                    struct cxusb_medion_auxbuf *auxbuf,
                                    struct urb *urb)
{
        unsigned long len;
        int i;
        bool ret;

        for (i = 0, len = 0; i < urb->number_of_packets; i++)
                len += urb->iso_frame_desc[i].actual_length;

        ret = cxusb_auxbuf_make_space(dvbdev, auxbuf, len);

        for (i = 0; i < urb->number_of_packets; i++) {
                unsigned int to_copy;

                to_copy = urb->iso_frame_desc[i].actual_length;

                memcpy(auxbuf->buf + auxbuf->paylen, urb->transfer_buffer +
                       urb->iso_frame_desc[i].offset, to_copy);

                auxbuf->paylen += to_copy;
        }

        return ret;
}

static bool cxusb_auxbuf_copy(struct cxusb_medion_auxbuf *auxbuf,
                              unsigned int pos, unsigned char *dest,
                              unsigned int len)
{
        if (pos + len > auxbuf->paylen)
                return false;

        memcpy(dest, auxbuf->buf + pos, len);

        return true;
}

static bool cxusb_medion_cf_refc_fld_chg(struct dvb_usb_device *dvbdev,
                                         struct cxusb_bt656_params *bt656,
                                         bool firstfield,
                                         unsigned int maxlines,
                                         unsigned int maxlinesamples,
                                         unsigned char buf[4])
{
        bool firstfield_code = (buf[3] & CXUSB_BT656_FIELD_MASK) ==
                CXUSB_BT656_FIELD_1;
        unsigned int remlines;

        if (bt656->line == 0 || firstfield == firstfield_code)
                return false;

        if (bt656->fmode == LINE_SAMPLES) {
                unsigned int remsamples = maxlinesamples -
                        bt656->linesamples;

                cxusb_vprintk(dvbdev, BT656,
                              "field %c after line %u field change\n",
                              firstfield ? '1' : '2', bt656->line);

                if (bt656->buf && remsamples > 0) {
                        memset(bt656->buf, 0, remsamples);
                        bt656->buf += remsamples;

                        cxusb_vprintk(dvbdev, BT656,
                                      "field %c line %u %u samples still remaining (of %u)\n",
                                      firstfield ? '1' : '2',
                                      bt656->line, remsamples,
                                      maxlinesamples);
                }

                bt656->line++;
        }

        remlines = maxlines - bt656->line;
        if (bt656->buf && remlines > 0) {
                memset(bt656->buf, 0, remlines * maxlinesamples);
                bt656->buf += remlines * maxlinesamples;

                cxusb_vprintk(dvbdev, BT656,
                              "field %c %u lines still remaining (of %u)\n",
                              firstfield ? '1' : '2', remlines,
                              maxlines);
        }

        return true;
}

static void cxusb_medion_cf_refc_start_sch(struct dvb_usb_device *dvbdev,
                                           struct cxusb_bt656_params *bt656,
                                           bool firstfield,
                                           unsigned char buf[4])
{
        bool firstfield_code = (buf[3] & CXUSB_BT656_FIELD_MASK) ==
                CXUSB_BT656_FIELD_1;
        bool sav_code = (buf[3] & CXUSB_BT656_SEAV_MASK) ==
                CXUSB_BT656_SEAV_SAV;
        bool vbi_code = (buf[3] & CXUSB_BT656_VBI_MASK) ==
                CXUSB_BT656_VBI_ON;

        if (!sav_code || firstfield != firstfield_code)
                return;

        if (!vbi_code) {
                cxusb_vprintk(dvbdev, BT656, "line start @ pos %u\n",
                              bt656->pos);

                bt656->linesamples = 0;
                bt656->fmode = LINE_SAMPLES;
        } else {
                cxusb_vprintk(dvbdev, BT656, "VBI start @ pos %u\n",
                              bt656->pos);

                bt656->fmode = VBI_SAMPLES;
        }
}

static void cxusb_medion_cf_refc_line_smpl(struct dvb_usb_device *dvbdev,
                                           struct cxusb_bt656_params *bt656,
                                           bool firstfield,
                                           unsigned int maxlinesamples,
                                           unsigned char buf[4])
{
        bool sav_code = (buf[3] & CXUSB_BT656_SEAV_MASK) ==
                CXUSB_BT656_SEAV_SAV;
        unsigned int remsamples;

        if (sav_code)
                cxusb_vprintk(dvbdev, BT656,
                              "SAV in line samples @ line %u, pos %u\n",
                              bt656->line, bt656->pos);

        remsamples = maxlinesamples - bt656->linesamples;
        if (bt656->buf && remsamples > 0) {
                memset(bt656->buf, 0, remsamples);
                bt656->buf += remsamples;

                cxusb_vprintk(dvbdev, BT656,
                              "field %c line %u %u samples still remaining (of %u)\n",
                              firstfield ? '1' : '2', bt656->line, remsamples,
                              maxlinesamples);
        }

        bt656->fmode = START_SEARCH;
        bt656->line++;
}

static void cxusb_medion_cf_refc_vbi_smpl(struct dvb_usb_device *dvbdev,
                                          struct cxusb_bt656_params *bt656,
                                          unsigned char buf[4])
{
        bool sav_code = (buf[3] & CXUSB_BT656_SEAV_MASK) ==
                CXUSB_BT656_SEAV_SAV;

        if (sav_code)
                cxusb_vprintk(dvbdev, BT656, "SAV in VBI samples @ pos %u\n",
                              bt656->pos);

        bt656->fmode = START_SEARCH;
}

/* returns whether the whole 4-byte code should be skipped in the buffer */
static bool cxusb_medion_cf_ref_code(struct dvb_usb_device *dvbdev,
                                     struct cxusb_bt656_params *bt656,
                                     bool firstfield,
                                     unsigned int maxlines,
                                     unsigned int maxlinesamples,
                                     unsigned char buf[4])
{
        if (bt656->fmode == START_SEARCH) {
                cxusb_medion_cf_refc_start_sch(dvbdev, bt656, firstfield, buf);
        } else if (bt656->fmode == LINE_SAMPLES) {
                cxusb_medion_cf_refc_line_smpl(dvbdev, bt656, firstfield,
                                               maxlinesamples, buf);
                return false;
        } else if (bt656->fmode == VBI_SAMPLES) {
                cxusb_medion_cf_refc_vbi_smpl(dvbdev, bt656, buf);
                return false;
        }

        return true;
}

static bool cxusb_medion_cs_start_sch(struct dvb_usb_device *dvbdev,
                                      struct cxusb_medion_auxbuf *auxbuf,
                                      struct cxusb_bt656_params *bt656,
                                      unsigned int maxlinesamples)
{
        unsigned char buf[64];
        unsigned int idx;
        unsigned int tocheck = clamp_t(size_t, maxlinesamples / 4, 3,
                                       sizeof(buf));

        if (!cxusb_auxbuf_copy(auxbuf, bt656->pos + 1, buf, tocheck))
                return false;

        for (idx = 0; idx <= tocheck - 3; idx++)
                if (memcmp(buf + idx, CXUSB_BT656_PREAMBLE, 3) == 0) {
                        bt656->pos += (1 + idx);
                        return true;
                }

        cxusb_vprintk(dvbdev, BT656, "line %u early start, pos %u\n",
                      bt656->line, bt656->pos);

        bt656->linesamples = 0;
        bt656->fmode = LINE_SAMPLES;

        return true;
}

static void cxusb_medion_cs_line_smpl(struct cxusb_bt656_params *bt656,
                                      unsigned int maxlinesamples,
                                      unsigned char val)
{
        if (bt656->buf)
                *(bt656->buf++) = val;

        bt656->linesamples++;
        bt656->pos++;

        if (bt656->linesamples >= maxlinesamples) {
                bt656->fmode = START_SEARCH;
                bt656->line++;
        }
}

static bool cxusb_medion_copy_samples(struct dvb_usb_device *dvbdev,
                                      struct cxusb_medion_auxbuf *auxbuf,
                                      struct cxusb_bt656_params *bt656,
                                      unsigned int maxlinesamples,
                                      unsigned char val)
{
        if (bt656->fmode == START_SEARCH && bt656->line > 0)
                return cxusb_medion_cs_start_sch(dvbdev, auxbuf, bt656,
                                                 maxlinesamples);
        else if (bt656->fmode == LINE_SAMPLES)
                cxusb_medion_cs_line_smpl(bt656, maxlinesamples, val);
        else /* TODO: copy VBI samples */
                bt656->pos++;

        return true;
}

static bool cxusb_medion_copy_field(struct dvb_usb_device *dvbdev,
                                    struct cxusb_medion_auxbuf *auxbuf,
                                    struct cxusb_bt656_params *bt656,
                                    bool firstfield,
                                    unsigned int maxlines,
                                    unsigned int maxlinesmpls)
{
        while (bt656->line < maxlines) {
                unsigned char val;

                if (!cxusb_auxbuf_copy(auxbuf, bt656->pos, &val, 1))
                        break;

                if (val == CXUSB_BT656_PREAMBLE[0]) {
                        unsigned char buf[4];

                        buf[0] = val;
                        if (!cxusb_auxbuf_copy(auxbuf, bt656->pos + 1,
                                               buf + 1, 3))
                                break;

                        if (buf[1] == CXUSB_BT656_PREAMBLE[1] &&
                            buf[2] == CXUSB_BT656_PREAMBLE[2]) {
                                /*
                                 * is this a field change?
                                 * if so, terminate copying the current field
                                 */
                                if (cxusb_medion_cf_refc_fld_chg(dvbdev,
                                                                 bt656,
                                                                 firstfield,
                                                                 maxlines,
                                                                 maxlinesmpls,
                                                                 buf))
                                        return true;

                                if (cxusb_medion_cf_ref_code(dvbdev, bt656,
                                                             firstfield,
                                                             maxlines,
                                                             maxlinesmpls,
                                                             buf))
                                        bt656->pos += 4;

                                continue;
                        }
                }

                if (!cxusb_medion_copy_samples(dvbdev, auxbuf, bt656,
                                               maxlinesmpls, val))
                        break;
        }

        if (bt656->line < maxlines) {
                cxusb_vprintk(dvbdev, BT656,
                              "end of buffer pos = %u, line = %u\n",
                              bt656->pos, bt656->line);
                return false;
        }

        return true;
}

static bool cxusb_medion_v_process_auxbuf(struct cxusb_medion_dev *cxdev,
                                          bool reset)
{
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        struct cxusb_bt656_params *bt656 = &cxdev->bt656;

        /*
         * if this is a new frame
         * fetch a buffer from list
         */
        if (bt656->mode == NEW_FRAME) {
                if (!list_empty(&cxdev->buflist)) {
                        cxdev->vbuf =
                                list_first_entry(&cxdev->buflist,
                                                 struct cxusb_medion_vbuffer,
                                                 list);
                        list_del(&cxdev->vbuf->list);
                } else {
                        dev_warn(&dvbdev->udev->dev, "no free buffers\n");
                }
        }

        if (bt656->mode == NEW_FRAME || reset) {
                cxusb_vprintk(dvbdev, URB, "will copy field 1\n");
                bt656->pos = 0;
                bt656->mode = FIRST_FIELD;
                bt656->fmode = START_SEARCH;
                bt656->line = 0;

                if (cxdev->vbuf) {
                        cxdev->vbuf->vb2.vb2_buf.timestamp = ktime_get_ns();
                        bt656->buf = vb2_plane_vaddr(&cxdev->vbuf->vb2.vb2_buf,
                                                     0);
                }
        }

        if (bt656->mode == FIRST_FIELD) {
                if (!cxusb_medion_copy_field(dvbdev, &cxdev->auxbuf, bt656,
                                             true, cxdev->height / 2,
                                             cxdev->width * 2))
                        return false;

                /*
                 * do not trim buffer there in case
                 * we need to reset the search later
                 */

                cxusb_vprintk(dvbdev, URB, "will copy field 2\n");
                bt656->mode = SECOND_FIELD;
                bt656->fmode = START_SEARCH;
                bt656->line = 0;
        }

        if (bt656->mode == SECOND_FIELD) {
                if (!cxusb_medion_copy_field(dvbdev, &cxdev->auxbuf, bt656,
                                             false, cxdev->height / 2,
                                             cxdev->width * 2))
                        return false;

                cxusb_auxbuf_head_trim(dvbdev, &cxdev->auxbuf, bt656->pos);

                bt656->mode = NEW_FRAME;

                if (cxdev->vbuf) {
                        vb2_set_plane_payload(&cxdev->vbuf->vb2.vb2_buf, 0,
                                              cxdev->width * cxdev->height * 2);

                        cxdev->vbuf->vb2.field = cxdev->field_order;
                        cxdev->vbuf->vb2.sequence = cxdev->vbuf_sequence++;

                        vb2_buffer_done(&cxdev->vbuf->vb2.vb2_buf,
                                        VB2_BUF_STATE_DONE);

                        cxdev->vbuf = NULL;
                        cxdev->bt656.buf = NULL;

                        cxusb_vprintk(dvbdev, URB, "frame done\n");
                } else {
                        cxusb_vprintk(dvbdev, URB, "frame skipped\n");
                        cxdev->vbuf_sequence++;
                }
        }

        return true;
}

static bool cxusb_medion_v_complete_handle_urb(struct cxusb_medion_dev *cxdev,
                                               bool *auxbuf_reset)
{
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        unsigned int urbn;
        struct urb *urb;
        int ret;

        *auxbuf_reset = false;

        urbn = cxdev->nexturb;
        if (!test_bit(urbn, &cxdev->urbcomplete))
                return false;

        clear_bit(urbn, &cxdev->urbcomplete);

        do {
                cxdev->nexturb++;
                cxdev->nexturb %= CXUSB_VIDEO_URBS;
                urb = cxdev->streamurbs[cxdev->nexturb];
        } while (!urb);

        urb = cxdev->streamurbs[urbn];
        cxusb_vprintk(dvbdev, URB, "URB %u status = %d\n", urbn, urb->status);

        if (urb->status == 0 || urb->status == -EXDEV) {
                int i;
                unsigned long len;

                for (i = 0, len = 0; i < urb->number_of_packets; i++)
                        len += urb->iso_frame_desc[i].actual_length;

                cxusb_vprintk(dvbdev, URB, "URB %u data len = %lu\n", urbn,
                              len);

                if (len > 0) {
                        cxusb_vprintk(dvbdev, URB, "appending URB\n");

                        /*
                         * append new data to auxbuf while
                         * overwriting old data if necessary
                         *
                         * if any overwrite happens then we can no
                         * longer rely on consistency of the whole
                         * data so let's start again the current
                         * auxbuf frame assembling process from
                         * the beginning
                         */
                        *auxbuf_reset =
                                !cxusb_auxbuf_append_urb(dvbdev,
                                                         &cxdev->auxbuf,
                                                         urb);
                }
        }

        cxusb_vprintk(dvbdev, URB, "URB %u resubmit\n", urbn);

        ret = usb_submit_urb(urb, GFP_KERNEL);
        if (ret != 0)
                dev_err(&dvbdev->udev->dev,
                        "unable to resubmit URB %u (%d), you'll have to restart streaming\n",
                        urbn, ret);

        /* next URB is complete already? reschedule us then to handle it */
        return test_bit(cxdev->nexturb, &cxdev->urbcomplete);
}

static void cxusb_medion_v_complete_work(struct work_struct *work)
{
        struct cxusb_medion_dev *cxdev = container_of(work,
                                                      struct cxusb_medion_dev,
                                                      urbwork);
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        bool auxbuf_reset;
        bool reschedule;

        mutex_lock(cxdev->videodev->lock);

        cxusb_vprintk(dvbdev, URB, "worker called, stop_streaming = %d\n",
                      (int)cxdev->stop_streaming);

        if (cxdev->stop_streaming)
                goto unlock;

        reschedule = cxusb_medion_v_complete_handle_urb(cxdev, &auxbuf_reset);

        if (cxusb_medion_v_process_auxbuf(cxdev, auxbuf_reset))
                /* reschedule us until auxbuf no longer can produce any frame */
                reschedule = true;

        if (reschedule) {
                cxusb_vprintk(dvbdev, URB, "rescheduling worker\n");
                schedule_work(&cxdev->urbwork);
        }

unlock:
        mutex_unlock(cxdev->videodev->lock);
}

static void cxusb_medion_v_complete(struct urb *u)
{
        struct dvb_usb_device *dvbdev = u->context;
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        unsigned int i;

        for (i = 0; i < CXUSB_VIDEO_URBS; i++)
                if (cxdev->streamurbs[i] == u)
                        break;

        if (i >= CXUSB_VIDEO_URBS) {
                dev_err(&dvbdev->udev->dev,
                        "complete on unknown URB\n");
                return;
        }

        cxusb_vprintk(dvbdev, URB, "URB %u complete\n", i);

        set_bit(i, &cxdev->urbcomplete);
        schedule_work(&cxdev->urbwork);
}

static void cxusb_medion_urbs_free(struct cxusb_medion_dev *cxdev)
{
        unsigned int i;

        for (i = 0; i < CXUSB_VIDEO_URBS; i++)
                if (cxdev->streamurbs[i]) {
                        kfree(cxdev->streamurbs[i]->transfer_buffer);
                        usb_free_urb(cxdev->streamurbs[i]);
                        cxdev->streamurbs[i] = NULL;
                }
}

static void cxusb_medion_return_buffers(struct cxusb_medion_dev *cxdev,
                                        bool requeue)
{
        struct cxusb_medion_vbuffer *vbuf, *vbuf_tmp;

        list_for_each_entry_safe(vbuf, vbuf_tmp, &cxdev->buflist,
                                 list) {
                list_del(&vbuf->list);
                vb2_buffer_done(&vbuf->vb2.vb2_buf,
                                requeue ? VB2_BUF_STATE_QUEUED :
                                VB2_BUF_STATE_ERROR);
        }

        if (cxdev->vbuf) {
                vb2_buffer_done(&cxdev->vbuf->vb2.vb2_buf,
                                requeue ? VB2_BUF_STATE_QUEUED :
                                VB2_BUF_STATE_ERROR);

                cxdev->vbuf = NULL;
                cxdev->bt656.buf = NULL;
        }
}

static int cxusb_medion_v_ss_auxbuf_alloc(struct cxusb_medion_dev *cxdev,
                                          int *npackets)
{
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        u8 *buf;
        unsigned int framelen, urblen, auxbuflen;

        framelen = (cxdev->width * 2 + 4 + 4) *
                (cxdev->height + 50 /* VBI lines */);

        /*
         * try to fit a whole frame into each URB, as long as doing so
         * does not require very high order memory allocations
         */
        BUILD_BUG_ON(CXUSB_VIDEO_URB_MAX_SIZE / CXUSB_VIDEO_PKT_SIZE >
                     CXUSB_VIDEO_MAX_FRAME_PKTS);
        *npackets = min_t(int, (framelen + CXUSB_VIDEO_PKT_SIZE - 1) /
                          CXUSB_VIDEO_PKT_SIZE,
                          CXUSB_VIDEO_URB_MAX_SIZE / CXUSB_VIDEO_PKT_SIZE);
        urblen = *npackets * CXUSB_VIDEO_PKT_SIZE;

        cxusb_vprintk(dvbdev, URB,
                      "each URB will have %d packets for total of %u bytes (%u x %u @ %u)\n",
                      *npackets, urblen, (unsigned int)cxdev->width,
                      (unsigned int)cxdev->height, framelen);

        auxbuflen = framelen + urblen;

        buf = vmalloc(auxbuflen);
        if (!buf)
                return -ENOMEM;

        cxusb_auxbuf_init(dvbdev, &cxdev->auxbuf, buf, auxbuflen);

        return 0;
}

static u32 cxusb_medion_norm2field_order(v4l2_std_id norm)
{
        bool is625 = norm & V4L2_STD_625_50;
        bool is525 = norm & V4L2_STD_525_60;

        if (!is625 && !is525)
                return V4L2_FIELD_NONE;

        if (is625 && is525)
                return V4L2_FIELD_NONE;

        if (is625)
                return V4L2_FIELD_SEQ_TB;
        else /* is525 */
                return V4L2_FIELD_SEQ_BT;
}

static u32 cxusb_medion_field_order(struct cxusb_medion_dev *cxdev)
{
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        u32 field;
        int ret;
        v4l2_std_id norm;

        /* TV tuner is PAL-only so it is always TB */
        if (cxdev->input == 0)
                return V4L2_FIELD_SEQ_TB;

        field = cxusb_medion_norm2field_order(cxdev->norm);
        if (field != V4L2_FIELD_NONE)
                return field;

        ret = v4l2_subdev_call(cxdev->cx25840, video, g_std, &norm);
        if (ret != 0) {
                cxusb_vprintk(dvbdev, OPS,
                              "cannot get current standard for input %u\n",
                              (unsigned int)cxdev->input);
        } else {
                field = cxusb_medion_norm2field_order(norm);
                if (field != V4L2_FIELD_NONE)
                        return field;
        }

        dev_warn(&dvbdev->udev->dev,
                 "cannot determine field order for the current standard setup and received signal, using TB\n");
        return V4L2_FIELD_SEQ_TB;
}

static int cxusb_medion_v_start_streaming(struct vb2_queue *q,
                                          unsigned int count)
{
        struct dvb_usb_device *dvbdev = vb2_get_drv_priv(q);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        u8 streamon_params[2] = { 0x03, 0x00 };
        int npackets, i;
        int ret;

        cxusb_vprintk(dvbdev, OPS, "should start streaming\n");

        if (cxdev->stop_streaming) {
                /* stream is being stopped */
                ret = -EBUSY;
                goto ret_retbufs;
        }

        cxdev->field_order = cxusb_medion_field_order(cxdev);

        ret = v4l2_subdev_call(cxdev->cx25840, video, s_stream, 1);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "unable to start stream (%d)\n", ret);
                goto ret_retbufs;
        }

        ret = cxusb_ctrl_msg(dvbdev, CMD_STREAMING_ON, streamon_params, 2,
                             NULL, 0);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "unable to start streaming (%d)\n", ret);
                goto ret_unstream_cx;
        }

        ret = cxusb_medion_v_ss_auxbuf_alloc(cxdev, &npackets);
        if (ret != 0)
                goto ret_unstream_md;

        for (i = 0; i < CXUSB_VIDEO_URBS; i++) {
                int framen;
                u8 *streambuf;
                struct urb *surb;

                /*
                 * TODO: change this to an array of single pages to avoid
                 * doing a large continuous allocation when (if)
                 * s-g isochronous USB transfers are supported
                 */
                streambuf = kmalloc_array(npackets, CXUSB_VIDEO_PKT_SIZE,
                                          GFP_KERNEL);
                if (!streambuf) {
                        if (i < 2) {
                                ret = -ENOMEM;
                                goto ret_freeab;
                        }
                        break;
                }

                surb = usb_alloc_urb(npackets, GFP_KERNEL);
                if (!surb) {
                        kfree(streambuf);
                        ret = -ENOMEM;
                        goto ret_freeu;
                }

                cxdev->streamurbs[i] = surb;
                surb->dev = dvbdev->udev;
                surb->context = dvbdev;
                surb->pipe = usb_rcvisocpipe(dvbdev->udev, 2);

                surb->interval = 1;
                surb->transfer_flags = URB_ISO_ASAP;

                surb->transfer_buffer = streambuf;

                surb->complete = cxusb_medion_v_complete;
                surb->number_of_packets = npackets;
                surb->transfer_buffer_length = npackets * CXUSB_VIDEO_PKT_SIZE;

                for (framen = 0; framen < npackets; framen++) {
                        surb->iso_frame_desc[framen].offset =
                                CXUSB_VIDEO_PKT_SIZE * framen;

                        surb->iso_frame_desc[framen].length =
                                CXUSB_VIDEO_PKT_SIZE;
                }
        }

        cxdev->urbcomplete = 0;
        cxdev->nexturb = 0;
        cxdev->vbuf_sequence = 0;

        cxdev->vbuf = NULL;
        cxdev->bt656.mode = NEW_FRAME;
        cxdev->bt656.buf = NULL;

        for (i = 0; i < CXUSB_VIDEO_URBS; i++)
                if (cxdev->streamurbs[i]) {
                        ret = usb_submit_urb(cxdev->streamurbs[i],
                                             GFP_KERNEL);
                        if (ret != 0)
                                dev_err(&dvbdev->udev->dev,
                                        "URB %d submission failed (%d)\n", i,
                                        ret);
                }

        return 0;

ret_freeu:
        cxusb_medion_urbs_free(cxdev);

ret_freeab:
        vfree(cxdev->auxbuf.buf);

ret_unstream_md:
        cxusb_ctrl_msg(dvbdev, CMD_STREAMING_OFF, NULL, 0, NULL, 0);

ret_unstream_cx:
        v4l2_subdev_call(cxdev->cx25840, video, s_stream, 0);

ret_retbufs:
        cxusb_medion_return_buffers(cxdev, true);

        return ret;
}

static void cxusb_medion_v_stop_streaming(struct vb2_queue *q)
{
        struct dvb_usb_device *dvbdev = vb2_get_drv_priv(q);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;
        unsigned int i;

        cxusb_vprintk(dvbdev, OPS, "should stop streaming\n");

        if (WARN_ON(cxdev->stop_streaming))
                return;

        cxdev->stop_streaming = true;

        cxusb_ctrl_msg(dvbdev, CMD_STREAMING_OFF, NULL, 0, NULL, 0);

        ret = v4l2_subdev_call(cxdev->cx25840, video, s_stream, 0);
        if (ret != 0)
                dev_err(&dvbdev->udev->dev, "unable to stop stream (%d)\n",
                        ret);

        /* let URB completion run */
        mutex_unlock(cxdev->videodev->lock);

        for (i = 0; i < CXUSB_VIDEO_URBS; i++)
                if (cxdev->streamurbs[i])
                        usb_kill_urb(cxdev->streamurbs[i]);

        flush_work(&cxdev->urbwork);

        mutex_lock(cxdev->videodev->lock);

        /* free transfer buffer and URB */
        vfree(cxdev->auxbuf.buf);

        cxusb_medion_urbs_free(cxdev);

        cxusb_medion_return_buffers(cxdev, false);

        cxdev->stop_streaming = false;
}

static void cxusub_medion_v_buf_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *v4l2buf = to_vb2_v4l2_buffer(vb);
        struct cxusb_medion_vbuffer *vbuf =
                container_of(v4l2buf, struct cxusb_medion_vbuffer, vb2);
        struct dvb_usb_device *dvbdev = vb2_get_drv_priv(vb->vb2_queue);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        /* cxusb_vprintk(dvbdev, OPS, "mmmm.. a fresh buffer...\n"); */

        list_add_tail(&vbuf->list, &cxdev->buflist);
}

static const struct vb2_ops cxdev_video_qops = {
        .queue_setup = cxusb_medion_v_queue_setup,
        .buf_init = cxusb_medion_v_buf_init,
        .start_streaming = cxusb_medion_v_start_streaming,
        .stop_streaming = cxusb_medion_v_stop_streaming,
        .buf_queue = cxusub_medion_v_buf_queue,
};

static const __u32 videocaps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TUNER |
        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
static const __u32 radiocaps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;

static int cxusb_medion_v_querycap(struct file *file, void *fh,
                                   struct v4l2_capability *cap)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);

        strscpy(cap->driver, dvbdev->udev->dev.driver->name,
                sizeof(cap->driver));
        strscpy(cap->card, "Medion 95700", sizeof(cap->card));
        usb_make_path(dvbdev->udev, cap->bus_info, sizeof(cap->bus_info));

        cap->capabilities = videocaps | radiocaps | V4L2_CAP_DEVICE_CAPS;

        return 0;
}

static int cxusb_medion_v_enum_fmt_vid_cap(struct file *file, void *fh,
                                           struct v4l2_fmtdesc *f)
{
        if (f->index != 0)
                return -EINVAL;

        f->pixelformat = V4L2_PIX_FMT_UYVY;

        return 0;
}

static int cxusb_medion_g_fmt_vid_cap(struct file *file, void *fh,
                                      struct v4l2_format *f)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        f->fmt.pix.width = cxdev->width;
        f->fmt.pix.height = cxdev->height;
        f->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
        f->fmt.pix.field = vb2_start_streaming_called(&cxdev->videoqueue) ?
                cxdev->field_order : cxusb_medion_field_order(cxdev);
        f->fmt.pix.bytesperline = cxdev->width * 2;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;

        return 0;
}

static int cxusb_medion_try_s_fmt_vid_cap(struct file *file,
                                          struct v4l2_format *f,
                                          bool isset)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        struct v4l2_subdev_format subfmt = {
                .which = isset ? V4L2_SUBDEV_FORMAT_ACTIVE :
                         V4L2_SUBDEV_FORMAT_TRY,
        };
        u32 field;
        int ret;

        if (isset && vb2_is_busy(&cxdev->videoqueue))
                return -EBUSY;

        field = vb2_start_streaming_called(&cxdev->videoqueue) ?
                cxdev->field_order : cxusb_medion_field_order(cxdev);

        subfmt.format.width = f->fmt.pix.width & ~1;
        subfmt.format.height = f->fmt.pix.height & ~1;
        subfmt.format.code = MEDIA_BUS_FMT_FIXED;
        subfmt.format.field = field;
        subfmt.format.colorspace = V4L2_COLORSPACE_SMPTE170M;

        ret = v4l2_subdev_call(cxdev->cx25840, pad, set_fmt, NULL, &subfmt);
        if (ret != 0)
                return ret;

        f->fmt.pix.width = subfmt.format.width;
        f->fmt.pix.height = subfmt.format.height;
        f->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
        f->fmt.pix.field = field;
        f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * f->fmt.pix.height;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

        if (isset) {
                cxdev->width = f->fmt.pix.width;
                cxdev->height = f->fmt.pix.height;
        }

        return 0;
}

static int cxusb_medion_try_fmt_vid_cap(struct file *file, void *fh,
                                        struct v4l2_format *f)
{
        return cxusb_medion_try_s_fmt_vid_cap(file, f, false);
}

static int cxusb_medion_s_fmt_vid_cap(struct file *file, void *fh,
                                      struct v4l2_format *f)
{
        return cxusb_medion_try_s_fmt_vid_cap(file, f, true);
}

static const struct {
        struct v4l2_input input;
        u32 inputcfg;
} cxusb_medion_inputs[] = {
        { .input = { .name = "TV tuner", .type = V4L2_INPUT_TYPE_TUNER,
                     .tuner = 0, .std = V4L2_STD_PAL },
          .inputcfg = CX25840_COMPOSITE2, },

        {  .input = { .name = "Composite", .type = V4L2_INPUT_TYPE_CAMERA,
                     .std = V4L2_STD_ALL },
           .inputcfg = CX25840_COMPOSITE1, },

        {  .input = { .name = "S-Video", .type = V4L2_INPUT_TYPE_CAMERA,
                      .std = V4L2_STD_ALL },
           .inputcfg = CX25840_SVIDEO_LUMA3 | CX25840_SVIDEO_CHROMA4 }
};

#define CXUSB_INPUT_CNT ARRAY_SIZE(cxusb_medion_inputs)

static int cxusb_medion_enum_input(struct file *file, void *fh,
                                   struct v4l2_input *inp)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        u32 index = inp->index;

        if (index >= CXUSB_INPUT_CNT)
                return -EINVAL;

        *inp = cxusb_medion_inputs[index].input;
        inp->index = index;
        inp->capabilities |= V4L2_IN_CAP_STD;

        if (index == cxdev->input) {
                int ret;
                u32 status = 0;

                ret = v4l2_subdev_call(cxdev->cx25840, video, g_input_status,
                                       &status);
                if (ret != 0)
                        dev_warn(&dvbdev->udev->dev,
                                 "cx25840 input status query failed (%d)\n",
                                 ret);
                else
                        inp->status = status;
        }

        return 0;
}

static int cxusb_medion_g_input(struct file *file, void *fh,
                                unsigned int *i)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        *i = cxdev->input;

        return 0;
}

static int cxusb_medion_set_norm(struct cxusb_medion_dev *cxdev,
                                 v4l2_std_id norm)
{
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;
        int ret;

        cxusb_vprintk(dvbdev, OPS,
                      "trying to set standard for input %u to %lx\n",
                      (unsigned int)cxdev->input,
                      (unsigned long)norm);

        /* no autodetection support */
        if (norm == V4L2_STD_UNKNOWN)
                return -EINVAL;

        /* on composite or S-Video any std is acceptable */
        if (cxdev->input != 0) {
                ret = v4l2_subdev_call(cxdev->cx25840, video, s_std, norm);
                if (ret)
                        return ret;

                goto ret_savenorm;
        }

        /* TV tuner is only able to demodulate PAL */
        if ((norm & ~V4L2_STD_PAL) != 0)
                return -EINVAL;

        ret = v4l2_subdev_call(cxdev->tda9887, video, s_std, norm);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "tda9887 norm setup failed (%d)\n",
                        ret);
                return ret;
        }

        ret = v4l2_subdev_call(cxdev->tuner, video, s_std, norm);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "tuner norm setup failed (%d)\n",
                        ret);
                return ret;
        }

        ret = v4l2_subdev_call(cxdev->cx25840, video, s_std, norm);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "cx25840 norm setup failed (%d)\n",
                        ret);
                return ret;
        }

ret_savenorm:
        cxdev->norm = norm;

        return 0;
}

static int cxusb_medion_s_input(struct file *file, void *fh,
                                unsigned int i)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;
        v4l2_std_id norm;

        if (i >= CXUSB_INPUT_CNT)
                return -EINVAL;

        ret = v4l2_subdev_call(cxdev->cx25840, video, s_routing,
                               cxusb_medion_inputs[i].inputcfg, 0, 0);
        if (ret != 0)
                return ret;

        cxdev->input = i;
        cxdev->videodev->tvnorms = cxusb_medion_inputs[i].input.std;

        norm = cxdev->norm & cxusb_medion_inputs[i].input.std;
        if (norm == 0)
                norm = cxusb_medion_inputs[i].input.std;

        cxusb_medion_set_norm(cxdev, norm);

        return 0;
}

static int cxusb_medion_g_tuner(struct file *file, void *fh,
                                struct v4l2_tuner *tuner)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        struct video_device *vdev = video_devdata(file);
        int ret;

        if (tuner->index != 0)
                return -EINVAL;

        if (vdev->vfl_type == VFL_TYPE_VIDEO)
                tuner->type = V4L2_TUNER_ANALOG_TV;
        else
                tuner->type = V4L2_TUNER_RADIO;

        tuner->capability = 0;
        tuner->afc = 0;

        /*
         * fills:
         * always: capability (static), rangelow (static), rangehigh (static)
         * radio mode: afc (may fail silently), rxsubchans (static), audmode
         */
        ret = v4l2_subdev_call(cxdev->tda9887, tuner, g_tuner, tuner);
        if (ret != 0)
                return ret;

        /*
         * fills:
         * always: capability (static), rangelow (static), rangehigh (static)
         * radio mode: rxsubchans (always stereo), audmode,
         * signal (might be wrong)
         */
        ret = v4l2_subdev_call(cxdev->tuner, tuner, g_tuner, tuner);
        if (ret != 0)
                return ret;

        tuner->signal = 0;

        /*
         * fills: TV mode: capability, rxsubchans, audmode, signal
         */
        ret = v4l2_subdev_call(cxdev->cx25840, tuner, g_tuner, tuner);
        if (ret != 0)
                return ret;

        if (vdev->vfl_type == VFL_TYPE_VIDEO)
                strscpy(tuner->name, "TV tuner", sizeof(tuner->name));
        else
                strscpy(tuner->name, "Radio tuner", sizeof(tuner->name));

        memset(tuner->reserved, 0, sizeof(tuner->reserved));

        return 0;
}

static int cxusb_medion_s_tuner(struct file *file, void *fh,
                                const struct v4l2_tuner *tuner)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        struct video_device *vdev = video_devdata(file);
        int ret;

        if (tuner->index != 0)
                return -EINVAL;

        ret = v4l2_subdev_call(cxdev->tda9887, tuner, s_tuner, tuner);
        if (ret != 0)
                return ret;

        ret = v4l2_subdev_call(cxdev->tuner, tuner, s_tuner, tuner);
        if (ret != 0)
                return ret;

        /*
         * make sure that cx25840 is in a correct TV / radio mode,
         * since calls above may have changed it for tuner / IF demod
         */
        if (vdev->vfl_type == VFL_TYPE_VIDEO)
                v4l2_subdev_call(cxdev->cx25840, video, s_std, cxdev->norm);
        else
                v4l2_subdev_call(cxdev->cx25840, tuner, s_radio);

        return v4l2_subdev_call(cxdev->cx25840, tuner, s_tuner, tuner);
}

static int cxusb_medion_g_frequency(struct file *file, void *fh,
                                    struct v4l2_frequency *freq)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        if (freq->tuner != 0)
                return -EINVAL;

        return v4l2_subdev_call(cxdev->tuner, tuner, g_frequency, freq);
}

static int cxusb_medion_s_frequency(struct file *file, void *fh,
                                    const struct v4l2_frequency *freq)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        struct video_device *vdev = video_devdata(file);
        int ret;

        if (freq->tuner != 0)
                return -EINVAL;

        ret = v4l2_subdev_call(cxdev->tda9887, tuner, s_frequency, freq);
        if (ret != 0)
                return ret;

        ret = v4l2_subdev_call(cxdev->tuner, tuner, s_frequency, freq);
        if (ret != 0)
                return ret;

        /*
         * make sure that cx25840 is in a correct TV / radio mode,
         * since calls above may have changed it for tuner / IF demod
         */
        if (vdev->vfl_type == VFL_TYPE_VIDEO)
                v4l2_subdev_call(cxdev->cx25840, video, s_std, cxdev->norm);
        else
                v4l2_subdev_call(cxdev->cx25840, tuner, s_radio);

        return v4l2_subdev_call(cxdev->cx25840, tuner, s_frequency, freq);
}

static int cxusb_medion_g_std(struct file *file, void *fh,
                              v4l2_std_id *norm)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        *norm = cxdev->norm;

        if (*norm == V4L2_STD_UNKNOWN)
                return -ENODATA;

        return 0;
}

static int cxusb_medion_s_std(struct file *file, void *fh,
                              v4l2_std_id norm)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        return cxusb_medion_set_norm(cxdev, norm);
}

static int cxusb_medion_querystd(struct file *file, void *fh,
                                 v4l2_std_id *norm)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        v4l2_std_id norm_mask;
        int ret;

        /*
         * make sure we don't have improper std bits set for the TV tuner
         * (could happen when no signal was present yet after reset)
         */
        if (cxdev->input == 0)
                norm_mask = V4L2_STD_PAL;
        else
                norm_mask = V4L2_STD_ALL;

        ret = v4l2_subdev_call(cxdev->cx25840, video, querystd, norm);
        if (ret != 0) {
                cxusb_vprintk(dvbdev, OPS,
                              "cannot get detected standard for input %u\n",
                              (unsigned int)cxdev->input);
                return ret;
        }

        cxusb_vprintk(dvbdev, OPS, "input %u detected standard is %lx\n",
                      (unsigned int)cxdev->input, (unsigned long)*norm);
        *norm &= norm_mask;

        return 0;
}

static int cxusb_medion_log_status(struct file *file, void *fh)
{
        struct dvb_usb_device *dvbdev = video_drvdata(file);
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        v4l2_device_call_all(&cxdev->v4l2dev, 0, core, log_status);

        return 0;
}

static const struct v4l2_ioctl_ops cxusb_video_ioctl = {
        .vidioc_querycap = cxusb_medion_v_querycap,
        .vidioc_enum_fmt_vid_cap = cxusb_medion_v_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap = cxusb_medion_g_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap = cxusb_medion_s_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap = cxusb_medion_try_fmt_vid_cap,
        .vidioc_enum_input = cxusb_medion_enum_input,
        .vidioc_g_input = cxusb_medion_g_input,
        .vidioc_s_input = cxusb_medion_s_input,
        .vidioc_g_tuner = cxusb_medion_g_tuner,
        .vidioc_s_tuner = cxusb_medion_s_tuner,
        .vidioc_g_frequency = cxusb_medion_g_frequency,
        .vidioc_s_frequency = cxusb_medion_s_frequency,
        .vidioc_g_std = cxusb_medion_g_std,
        .vidioc_s_std = cxusb_medion_s_std,
        .vidioc_querystd = cxusb_medion_querystd,
        .vidioc_log_status = cxusb_medion_log_status,
        .vidioc_reqbufs = vb2_ioctl_reqbufs,
        .vidioc_querybuf = vb2_ioctl_querybuf,
        .vidioc_qbuf = vb2_ioctl_qbuf,
        .vidioc_dqbuf = vb2_ioctl_dqbuf,
        .vidioc_create_bufs = vb2_ioctl_create_bufs,
        .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
        .vidioc_streamon = vb2_ioctl_streamon,
        .vidioc_streamoff = vb2_ioctl_streamoff
};

static const struct v4l2_ioctl_ops cxusb_radio_ioctl = {
        .vidioc_querycap = cxusb_medion_v_querycap,
        .vidioc_g_tuner = cxusb_medion_g_tuner,
        .vidioc_s_tuner = cxusb_medion_s_tuner,
        .vidioc_g_frequency = cxusb_medion_g_frequency,
        .vidioc_s_frequency = cxusb_medion_s_frequency,
        .vidioc_log_status = cxusb_medion_log_status
};

/*
 * in principle, this should be const, but s_io_pin_config is declared
 * to take non-const, and gcc complains
 */
static struct v4l2_subdev_io_pin_config cxusub_medion_pin_config[] = {
        { .pin = CX25840_PIN_DVALID_PRGM0, .function = CX25840_PAD_DEFAULT,
          .strength = CX25840_PIN_DRIVE_MEDIUM },
        { .pin = CX25840_PIN_PLL_CLK_PRGM7, .function = CX25840_PAD_AUX_PLL },
        { .pin = CX25840_PIN_HRESET_PRGM2, .function = CX25840_PAD_ACTIVE,
          .strength = CX25840_PIN_DRIVE_MEDIUM }
};

int cxusb_medion_analog_init(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        u8 tuner_analog_msg_data[] = { 0x9c, 0x60, 0x85, 0x54 };
        struct i2c_msg tuner_analog_msg = { .addr = 0x61, .flags = 0,
                                            .buf = tuner_analog_msg_data,
                                            .len =
                                            sizeof(tuner_analog_msg_data) };
        struct v4l2_subdev_format subfmt = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
        };
        int ret;

        /* switch tuner to analog mode so IF demod will become accessible */
        ret = i2c_transfer(&dvbdev->i2c_adap, &tuner_analog_msg, 1);
        if (ret != 1)
                dev_warn(&dvbdev->udev->dev,
                         "tuner analog switch failed (%d)\n", ret);

        /*
         * cx25840 might have lost power during mode switching so we need
         * to set it again
         */
        ret = v4l2_subdev_call(cxdev->cx25840, core, reset, 0);
        if (ret != 0)
                dev_warn(&dvbdev->udev->dev,
                         "cx25840 reset failed (%d)\n", ret);

        ret = v4l2_subdev_call(cxdev->cx25840, video, s_routing,
                               CX25840_COMPOSITE1, 0, 0);
        if (ret != 0)
                dev_warn(&dvbdev->udev->dev,
                         "cx25840 initial input setting failed (%d)\n", ret);

        /* composite */
        cxdev->input = 1;
        cxdev->videodev->tvnorms = V4L2_STD_ALL;
        cxdev->norm = V4L2_STD_PAL;

        /* TODO: setup audio samples insertion */

        ret = v4l2_subdev_call(cxdev->cx25840, core, s_io_pin_config,
                               ARRAY_SIZE(cxusub_medion_pin_config),
                               cxusub_medion_pin_config);
        if (ret != 0)
                dev_warn(&dvbdev->udev->dev,
                         "cx25840 pin config failed (%d)\n", ret);

        /* make sure that we aren't in radio mode */
        v4l2_subdev_call(cxdev->tda9887, video, s_std, cxdev->norm);
        v4l2_subdev_call(cxdev->tuner, video, s_std, cxdev->norm);
        v4l2_subdev_call(cxdev->cx25840, video, s_std, cxdev->norm);

        subfmt.format.width = cxdev->width;
        subfmt.format.height = cxdev->height;
        subfmt.format.code = MEDIA_BUS_FMT_FIXED;
        subfmt.format.field = V4L2_FIELD_SEQ_TB;
        subfmt.format.colorspace = V4L2_COLORSPACE_SMPTE170M;

        ret = v4l2_subdev_call(cxdev->cx25840, pad, set_fmt, NULL, &subfmt);
        if (ret != 0)
                dev_warn(&dvbdev->udev->dev,
                         "cx25840 format set failed (%d)\n", ret);

        if (ret == 0) {
                cxdev->width = subfmt.format.width;
                cxdev->height = subfmt.format.height;
        }

        return 0;
}

static int cxusb_videoradio_open(struct file *f)
{
        struct dvb_usb_device *dvbdev = video_drvdata(f);
        int ret;

        /*
         * no locking needed since this call only modifies analog
         * state if there are no other analog handles currenly
         * opened so ops done via them cannot create a conflict
         */
        ret = cxusb_medion_get(dvbdev, CXUSB_OPEN_ANALOG);
        if (ret != 0)
                return ret;

        ret = v4l2_fh_open(f);
        if (ret != 0)
                goto ret_release;

        cxusb_vprintk(dvbdev, OPS, "got open\n");

        return 0;

ret_release:
        cxusb_medion_put(dvbdev);

        return ret;
}

static int cxusb_videoradio_release(struct file *f)
{
        struct video_device *vdev = video_devdata(f);
        struct dvb_usb_device *dvbdev = video_drvdata(f);
        int ret;

        cxusb_vprintk(dvbdev, OPS, "got release\n");

        if (vdev->vfl_type == VFL_TYPE_VIDEO)
                ret = vb2_fop_release(f);
        else
                ret = v4l2_fh_release(f);

        cxusb_medion_put(dvbdev);

        return ret;
}

static const struct v4l2_file_operations cxusb_video_fops = {
        .owner = THIS_MODULE,
        .read = vb2_fop_read,
        .poll = vb2_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap = vb2_fop_mmap,
        .open = cxusb_videoradio_open,
        .release = cxusb_videoradio_release
};

static const struct v4l2_file_operations cxusb_radio_fops = {
        .owner = THIS_MODULE,
        .unlocked_ioctl = video_ioctl2,
        .open = cxusb_videoradio_open,
        .release = cxusb_videoradio_release
};

static void cxusb_medion_v4l2_release(struct v4l2_device *v4l2_dev)
{
        struct cxusb_medion_dev *cxdev =
                container_of(v4l2_dev, struct cxusb_medion_dev, v4l2dev);
        struct dvb_usb_device *dvbdev = cxdev->dvbdev;

        cxusb_vprintk(dvbdev, OPS, "v4l2 device release\n");

        v4l2_device_unregister(&cxdev->v4l2dev);

        mutex_destroy(&cxdev->dev_lock);

        while (completion_done(&cxdev->v4l2_release))
                schedule();

        complete(&cxdev->v4l2_release);
}

static void cxusb_medion_videodev_release(struct video_device *vdev)
{
        struct dvb_usb_device *dvbdev = video_get_drvdata(vdev);

        cxusb_vprintk(dvbdev, OPS, "video device release\n");

        video_device_release(vdev);
}

static int cxusb_medion_register_analog_video(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;

        cxdev->videoqueue.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        cxdev->videoqueue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ |
                VB2_DMABUF;
        cxdev->videoqueue.ops = &cxdev_video_qops;
        cxdev->videoqueue.mem_ops = &vb2_vmalloc_memops;
        cxdev->videoqueue.drv_priv = dvbdev;
        cxdev->videoqueue.buf_struct_size =
                sizeof(struct cxusb_medion_vbuffer);
        cxdev->videoqueue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        cxdev->videoqueue.min_queued_buffers = 6;
        cxdev->videoqueue.lock = &cxdev->dev_lock;

        ret = vb2_queue_init(&cxdev->videoqueue);
        if (ret) {
                dev_err(&dvbdev->udev->dev,
                        "video queue init failed, ret = %d\n", ret);
                return ret;
        }

        cxdev->videodev = video_device_alloc();
        if (!cxdev->videodev) {
                dev_err(&dvbdev->udev->dev, "video device alloc failed\n");
                return -ENOMEM;
        }

        cxdev->videodev->device_caps = videocaps;
        cxdev->videodev->fops = &cxusb_video_fops;
        cxdev->videodev->v4l2_dev = &cxdev->v4l2dev;
        cxdev->videodev->queue = &cxdev->videoqueue;
        strscpy(cxdev->videodev->name, "cxusb", sizeof(cxdev->videodev->name));
        cxdev->videodev->vfl_dir = VFL_DIR_RX;
        cxdev->videodev->ioctl_ops = &cxusb_video_ioctl;
        cxdev->videodev->tvnorms = V4L2_STD_ALL;
        cxdev->videodev->release = cxusb_medion_videodev_release;
        cxdev->videodev->lock = &cxdev->dev_lock;
        video_set_drvdata(cxdev->videodev, dvbdev);

        ret = video_register_device(cxdev->videodev, VFL_TYPE_VIDEO, -1);
        if (ret) {
                dev_err(&dvbdev->udev->dev,
                        "video device register failed, ret = %d\n", ret);
                goto ret_vrelease;
        }

        return 0;

ret_vrelease:
        video_device_release(cxdev->videodev);
        return ret;
}

static int cxusb_medion_register_analog_radio(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;

        cxdev->radiodev = video_device_alloc();
        if (!cxdev->radiodev) {
                dev_err(&dvbdev->udev->dev, "radio device alloc failed\n");
                return -ENOMEM;
        }

        cxdev->radiodev->device_caps = radiocaps;
        cxdev->radiodev->fops = &cxusb_radio_fops;
        cxdev->radiodev->v4l2_dev = &cxdev->v4l2dev;
        strscpy(cxdev->radiodev->name, "cxusb", sizeof(cxdev->radiodev->name));
        cxdev->radiodev->vfl_dir = VFL_DIR_RX;
        cxdev->radiodev->ioctl_ops = &cxusb_radio_ioctl;
        cxdev->radiodev->release = video_device_release;
        cxdev->radiodev->lock = &cxdev->dev_lock;
        video_set_drvdata(cxdev->radiodev, dvbdev);

        ret = video_register_device(cxdev->radiodev, VFL_TYPE_RADIO, -1);
        if (ret) {
                dev_err(&dvbdev->udev->dev,
                        "radio device register failed, ret = %d\n", ret);
                video_device_release(cxdev->radiodev);
                return ret;
        }

        return 0;
}

static int cxusb_medion_register_analog_subdevs(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;
        struct tuner_setup tun_setup;

        /* attach cx25840 capture chip */
        cxdev->cx25840 = v4l2_i2c_new_subdev(&cxdev->v4l2dev,
                                             &dvbdev->i2c_adap,
                                             "cx25840", 0x44, NULL);
        if (!cxdev->cx25840) {
                dev_err(&dvbdev->udev->dev, "cx25840 not found\n");
                return -ENODEV;
        }

        /*
         * Initialize cx25840 chip by calling its subdevice init core op.
         *
         * This switches it into the generic mode that disables some of
         * ivtv-related hacks in the cx25840 driver while allowing setting
         * of the chip video output configuration (passed in the call below
         * as the last argument).
         */
        ret = v4l2_subdev_call(cxdev->cx25840, core, init,
                               CX25840_VCONFIG_FMT_BT656 |
                               CX25840_VCONFIG_RES_8BIT |
                               CX25840_VCONFIG_VBIRAW_DISABLED |
                               CX25840_VCONFIG_ANCDATA_DISABLED |
                               CX25840_VCONFIG_ACTIVE_COMPOSITE |
                               CX25840_VCONFIG_VALID_ANDACTIVE |
                               CX25840_VCONFIG_HRESETW_NORMAL |
                               CX25840_VCONFIG_CLKGATE_NONE |
                               CX25840_VCONFIG_DCMODE_DWORDS);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "cx25840 init failed (%d)\n", ret);
                return ret;
        }

        /* attach analog tuner */
        cxdev->tuner = v4l2_i2c_new_subdev(&cxdev->v4l2dev,
                                           &dvbdev->i2c_adap,
                                           "tuner", 0x61, NULL);
        if (!cxdev->tuner) {
                dev_err(&dvbdev->udev->dev, "tuner not found\n");
                return -ENODEV;
        }

        /* configure it */
        memset(&tun_setup, 0, sizeof(tun_setup));
        tun_setup.addr = 0x61;
        tun_setup.type = TUNER_PHILIPS_FMD1216ME_MK3;
        tun_setup.mode_mask = T_RADIO | T_ANALOG_TV;
        v4l2_subdev_call(cxdev->tuner, tuner, s_type_addr, &tun_setup);

        /* attach IF demod */
        cxdev->tda9887 = v4l2_i2c_new_subdev(&cxdev->v4l2dev,
                                             &dvbdev->i2c_adap,
                                             "tuner", 0x43, NULL);
        if (!cxdev->tda9887) {
                dev_err(&dvbdev->udev->dev, "tda9887 not found\n");
                return -ENODEV;
        }

        return 0;
}

int cxusb_medion_register_analog(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;
        int ret;

        mutex_init(&cxdev->dev_lock);

        init_completion(&cxdev->v4l2_release);

        cxdev->v4l2dev.release = cxusb_medion_v4l2_release;

        ret = v4l2_device_register(&dvbdev->udev->dev, &cxdev->v4l2dev);
        if (ret != 0) {
                dev_err(&dvbdev->udev->dev,
                        "V4L2 device registration failed, ret = %d\n", ret);
                mutex_destroy(&cxdev->dev_lock);
                return ret;
        }

        ret = cxusb_medion_register_analog_subdevs(dvbdev);
        if (ret)
                goto ret_unregister;

        INIT_WORK(&cxdev->urbwork, cxusb_medion_v_complete_work);
        INIT_LIST_HEAD(&cxdev->buflist);

        cxdev->width = 320;
        cxdev->height = 240;

        ret = cxusb_medion_register_analog_video(dvbdev);
        if (ret)
                goto ret_unregister;

        ret = cxusb_medion_register_analog_radio(dvbdev);
        if (ret)
                goto ret_vunreg;

        return 0;

ret_vunreg:
        vb2_video_unregister_device(cxdev->videodev);

ret_unregister:
        v4l2_device_put(&cxdev->v4l2dev);
        wait_for_completion(&cxdev->v4l2_release);

        return ret;
}

void cxusb_medion_unregister_analog(struct dvb_usb_device *dvbdev)
{
        struct cxusb_medion_dev *cxdev = dvbdev->priv;

        cxusb_vprintk(dvbdev, OPS, "unregistering analog\n");

        video_unregister_device(cxdev->radiodev);
        vb2_video_unregister_device(cxdev->videodev);

        v4l2_device_put(&cxdev->v4l2dev);
        wait_for_completion(&cxdev->v4l2_release);

        cxusb_vprintk(dvbdev, OPS, "analog unregistered\n");
}