/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * virtio input device emulation.
 */

#include <sys/param.h>
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>

#include <capsicum_helpers.h>
#endif
#include <sys/ioctl.h>
#include <sys/linker_set.h>
#include <sys/uio.h>

#include <dev/evdev/input.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "bhyverun.h"
#include "config.h"
#include "debug.h"
#include "mevent.h"
#include "pci_emul.h"
#include "virtio.h"

#define VTINPUT_RINGSZ 64

#define VTINPUT_MAX_PKT_LEN 10

/*
 * Queue definitions.
 */
#define VTINPUT_EVENTQ 0
#define VTINPUT_STATUSQ 1

#define VTINPUT_MAXQ 2

static int pci_vtinput_debug;
#define DPRINTF(params)        \
        if (pci_vtinput_debug) \
        PRINTLN params
#define WPRINTF(params) PRINTLN params

enum vtinput_config_select {
        VTINPUT_CFG_UNSET = 0x00,
        VTINPUT_CFG_ID_NAME = 0x01,
        VTINPUT_CFG_ID_SERIAL = 0x02,
        VTINPUT_CFG_ID_DEVIDS = 0x03,
        VTINPUT_CFG_PROP_BITS = 0x10,
        VTINPUT_CFG_EV_BITS = 0x11,
        VTINPUT_CFG_ABS_INFO = 0x12
};

struct vtinput_absinfo {
        uint32_t min;
        uint32_t max;
        uint32_t fuzz;
        uint32_t flat;
        uint32_t res;
} __packed;

struct vtinput_devids {
        uint16_t bustype;
        uint16_t vendor;
        uint16_t product;
        uint16_t version;
} __packed;

struct vtinput_config {
        uint8_t select;
        uint8_t subsel;
        uint8_t size;
        uint8_t reserved[5];
        union {
                char string[128];
                uint8_t bitmap[128];
                struct vtinput_absinfo abs;
                struct vtinput_devids ids;
        } u;
} __packed;

struct vtinput_event {
        uint16_t type;
        uint16_t code;
        uint32_t value;
} __packed;

struct vtinput_event_elem {
        struct vtinput_event event;
        struct iovec iov;
        uint16_t idx;
};

struct vtinput_eventqueue {
        struct vtinput_event_elem *events;
        uint32_t size;
        uint32_t idx;
};

/*
 * Per-device softc
 */
struct pci_vtinput_softc {
        struct virtio_softc vsc_vs;
        struct vqueue_info vsc_queues[VTINPUT_MAXQ];
        pthread_mutex_t vsc_mtx;
        const char *vsc_evdev;
        int vsc_fd;
        struct vtinput_config vsc_config;
        int vsc_config_valid;
        struct mevent *vsc_evp;
        struct vtinput_eventqueue vsc_eventqueue;
};

static void pci_vtinput_reset(void *);
static int pci_vtinput_cfgread(void *, int, int, uint32_t *);
static int pci_vtinput_cfgwrite(void *, int, int, uint32_t);

static struct virtio_consts vtinput_vi_consts = {
        .vc_name =      "vtinput",
        .vc_nvq =       VTINPUT_MAXQ,
        .vc_cfgsize =   sizeof(struct vtinput_config),
        .vc_reset =     pci_vtinput_reset,
        .vc_cfgread =   pci_vtinput_cfgread,
        .vc_cfgwrite =  pci_vtinput_cfgwrite,
        .vc_hv_caps =   0,
};

static void
pci_vtinput_reset(void *vsc)
{
        struct pci_vtinput_softc *sc = vsc;

        DPRINTF(("%s: device reset requested", __func__));
        vi_reset_dev(&sc->vsc_vs);
}

static void
pci_vtinput_notify_eventq(void *vsc __unused, struct vqueue_info *vq __unused)
{
        DPRINTF(("%s", __func__));
}

static void
pci_vtinput_notify_statusq(void *vsc, struct vqueue_info *vq)
{
        struct pci_vtinput_softc *sc = vsc;

        while (vq_has_descs(vq)) {
                /* get descriptor chain */
                struct iovec iov;
                struct vi_req req;
                const int n = vq_getchain(vq, &iov, 1, &req);
                if (n <= 0) {
                        WPRINTF(("%s: invalid descriptor: %d", __func__, n));
                        return;
                }

                /* get event */
                struct vtinput_event event;
                memcpy(&event, iov.iov_base, sizeof(event));

                /*
                 * on multi touch devices:
                 * - host send EV_MSC to guest
                 * - guest sends EV_MSC back to host
                 * - host writes EV_MSC to evdev
                 * - evdev saves EV_MSC in it's event buffer
                 * - host receives an extra EV_MSC by reading the evdev event
                 *   buffer
                 * - frames become larger and larger
                 * avoid endless loops by ignoring EV_MSC
                 */
                if (event.type == EV_MSC) {
                        vq_relchain(vq, req.idx, sizeof(event));
                        continue;
                }

                /* send event to evdev */
                struct input_event host_event;
                host_event.type = event.type;
                host_event.code = event.code;
                host_event.value = event.value;
                if (gettimeofday(&host_event.time, NULL) != 0) {
                        WPRINTF(("%s: failed gettimeofday", __func__));
                }
                if (write(sc->vsc_fd, &host_event, sizeof(host_event)) == -1) {
                        WPRINTF(("%s: failed to write host_event", __func__));
                }

                vq_relchain(vq, req.idx, sizeof(event));
        }
        vq_endchains(vq, 1);
}

static int
pci_vtinput_get_bitmap(struct pci_vtinput_softc *sc, int cmd, int count)
{
        if (count <= 0 || !sc) {
                return (-1);
        }

        /* query bitmap */
        memset(sc->vsc_config.u.bitmap, 0, sizeof(sc->vsc_config.u.bitmap));
        if (ioctl(sc->vsc_fd, cmd, sc->vsc_config.u.bitmap) < 0) {
                return (-1);
        }

        /* get number of set bytes in bitmap */
        for (int i = count - 1; i >= 0; i--) {
                if (sc->vsc_config.u.bitmap[i]) {
                        return i + 1;
                }
        }

        return (-1);
}

static int
pci_vtinput_read_config_id_name(struct pci_vtinput_softc *sc)
{
        char name[128];
        if (ioctl(sc->vsc_fd, EVIOCGNAME(sizeof(name) - 1), name) < 0) {
                return (1);
        }

        memcpy(sc->vsc_config.u.string, name, sizeof(name));
        sc->vsc_config.size = strnlen(name, sizeof(name));

        return (0);
}

static int
pci_vtinput_read_config_id_serial(struct pci_vtinput_softc *sc)
{
        /* serial isn't supported */
        sc->vsc_config.size = 0;

        return (0);
}

static int
pci_vtinput_read_config_id_devids(struct pci_vtinput_softc *sc)
{
        struct input_id devids;
        if (ioctl(sc->vsc_fd, EVIOCGID, &devids)) {
                return (1);
        }

        sc->vsc_config.u.ids.bustype = devids.bustype;
        sc->vsc_config.u.ids.vendor = devids.vendor;
        sc->vsc_config.u.ids.product = devids.product;
        sc->vsc_config.u.ids.version = devids.version;
        sc->vsc_config.size = sizeof(struct vtinput_devids);

        return (0);
}

static int
pci_vtinput_read_config_prop_bits(struct pci_vtinput_softc *sc)
{
        /*
         * Evdev bitmap countains 1 bit per count. Additionally evdev bitmaps
         * are arrays of longs instead of chars. Calculate how many longs are
         * required for evdev bitmap. Multiply that with sizeof(long) to get the
         * number of elements.
         */
        const int count = howmany(INPUT_PROP_CNT, sizeof(long) * 8) *
            sizeof(long);
        const unsigned int cmd = EVIOCGPROP(count);
        const int size = pci_vtinput_get_bitmap(sc, cmd, count);
        if (size <= 0) {
                return (1);
        }

        sc->vsc_config.size = size;

        return (0);
}

static int
pci_vtinput_read_config_ev_bits(struct pci_vtinput_softc *sc, uint8_t type)
{
        int count;

        switch (type) {
        case EV_KEY:
                count = KEY_CNT;
                break;
        case EV_REL:
                count = REL_CNT;
                break;
        case EV_ABS:
                count = ABS_CNT;
                break;
        case EV_MSC:
                count = MSC_CNT;
                break;
        case EV_SW:
                count = SW_CNT;
                break;
        case EV_LED:
                count = LED_CNT;
                break;
        default:
                return (1);
        }

        /*
         * Evdev bitmap countains 1 bit per count. Additionally evdev bitmaps
         * are arrays of longs instead of chars. Calculate how many longs are
         * required for evdev bitmap. Multiply that with sizeof(long) to get the
         * number of elements.
         */
        count = howmany(count, sizeof(long) * 8) * sizeof(long);
        const unsigned int cmd = EVIOCGBIT(sc->vsc_config.subsel, count);
        const int size = pci_vtinput_get_bitmap(sc, cmd, count);
        if (size <= 0) {
                return (1);
        }

        sc->vsc_config.size = size;

        return (0);
}

static int
pci_vtinput_read_config_abs_info(struct pci_vtinput_softc *sc)
{
        /* check if evdev has EV_ABS */
        if (!pci_vtinput_read_config_ev_bits(sc, EV_ABS)) {
                return (1);
        }

        /* get abs information */
        struct input_absinfo abs;
        if (ioctl(sc->vsc_fd, EVIOCGABS(sc->vsc_config.subsel), &abs) < 0) {
                return (1);
        }

        /* save abs information */
        sc->vsc_config.u.abs.min = abs.minimum;
        sc->vsc_config.u.abs.max = abs.maximum;
        sc->vsc_config.u.abs.fuzz = abs.fuzz;
        sc->vsc_config.u.abs.flat = abs.flat;
        sc->vsc_config.u.abs.res = abs.resolution;
        sc->vsc_config.size = sizeof(struct vtinput_absinfo);

        return (0);
}

static int
pci_vtinput_read_config(struct pci_vtinput_softc *sc)
{
        switch (sc->vsc_config.select) {
        case VTINPUT_CFG_UNSET:
                return (0);
        case VTINPUT_CFG_ID_NAME:
                return pci_vtinput_read_config_id_name(sc);
        case VTINPUT_CFG_ID_SERIAL:
                return pci_vtinput_read_config_id_serial(sc);
        case VTINPUT_CFG_ID_DEVIDS:
                return pci_vtinput_read_config_id_devids(sc);
        case VTINPUT_CFG_PROP_BITS:
                return pci_vtinput_read_config_prop_bits(sc);
        case VTINPUT_CFG_EV_BITS:
                return pci_vtinput_read_config_ev_bits(
                    sc, sc->vsc_config.subsel);
        case VTINPUT_CFG_ABS_INFO:
                return pci_vtinput_read_config_abs_info(sc);
        default:
                return (1);
        }
}

static int
pci_vtinput_cfgread(void *vsc, int offset, int size, uint32_t *retval)
{
        struct pci_vtinput_softc *sc = vsc;

        /* check for valid offset and size */
        if (offset + size > (int)sizeof(struct vtinput_config)) {
                WPRINTF(("%s: read to invalid offset/size %d/%d", __func__,
                    offset, size));
                memset(retval, 0, size);
                return (0);
        }

        /* read new config values, if select and subsel changed. */
        if (!sc->vsc_config_valid) {
                if (pci_vtinput_read_config(sc) != 0) {
                        DPRINTF(("%s: could not read config %d/%d", __func__,
                            sc->vsc_config.select, sc->vsc_config.subsel));
                        memset(retval, 0, size);
                        return (0);
                }
                sc->vsc_config_valid = 1;
        }

        uint8_t *ptr = (uint8_t *)&sc->vsc_config;
        memcpy(retval, ptr + offset, size);

        return (0);
}

static int
pci_vtinput_cfgwrite(void *vsc, int offset, int size, uint32_t value)
{
        struct pci_vtinput_softc *sc = vsc;

        /* guest can only write to select and subsel fields */
        if (offset + size > 2) {
                WPRINTF(("%s: write to readonly reg %d", __func__, offset));
                return (1);
        }

        /* copy value into config */
        uint8_t *ptr = (uint8_t *)&sc->vsc_config;
        memcpy(ptr + offset, &value, size);

        /* select/subsel changed, query new config on next cfgread */
        sc->vsc_config_valid = 0;

        return (0);
}

static int
vtinput_eventqueue_add_event(
    struct vtinput_eventqueue *queue, struct input_event *e)
{
        /* check if queue is full */
        if (queue->idx >= queue->size) {
                /* alloc new elements for queue */
                const uint32_t newSize = queue->idx;
                void *newPtr = realloc(queue->events,
                    queue->size * sizeof(struct vtinput_event_elem));
                if (newPtr == NULL) {
                        WPRINTF(("%s: realloc memory for eventqueue failed!",
                            __func__));
                        return (1);
                }
                queue->events = newPtr;
                queue->size = newSize;
        }

        /* save event */
        struct vtinput_event *event = &queue->events[queue->idx].event;
        event->type = e->type;
        event->code = e->code;
        event->value = e->value;
        queue->idx++;

        return (0);
}

static void
vtinput_eventqueue_clear(struct vtinput_eventqueue *queue)
{
        /* just reset index to clear queue */
        queue->idx = 0;
}

static void
vtinput_eventqueue_send_events(
    struct vtinput_eventqueue *queue, struct vqueue_info *vq)
{
        /*
         * First iteration through eventqueue:
         *   Get descriptor chains.
         */
        for (uint32_t i = 0; i < queue->idx; ++i) {
                /* get descriptor */
                if (!vq_has_descs(vq)) {
                        /*
                         * We don't have enough descriptors for all events.
                         * Return chains back to guest.
                         */
                        vq_retchains(vq, i);
                        WPRINTF((
                            "%s: not enough available descriptors, dropping %d events",
                            __func__, queue->idx));
                        goto done;
                }

                /* get descriptor chain */
                struct iovec iov;
                struct vi_req req;
                const int n = vq_getchain(vq, &iov, 1, &req);
                if (n <= 0) {
                        WPRINTF(("%s: invalid descriptor: %d", __func__, n));
                        return;
                }
                if (n != 1) {
                        WPRINTF(
                            ("%s: invalid number of descriptors in chain: %d",
                                __func__, n));
                        /* release invalid chain */
                        vq_relchain(vq, req.idx, 0);
                        return;
                }
                if (iov.iov_len < sizeof(struct vtinput_event)) {
                        WPRINTF(("%s: invalid descriptor length: %lu", __func__,
                            iov.iov_len));
                        /* release invalid chain */
                        vq_relchain(vq, req.idx, 0);
                        return;
                }

                /* save descriptor */
                queue->events[i].iov = iov;
                queue->events[i].idx = req.idx;
        }

        /*
         * Second iteration through eventqueue:
         *   Send events to guest by releasing chains
         */
        for (uint32_t i = 0; i < queue->idx; ++i) {
                struct vtinput_event_elem event = queue->events[i];
                memcpy(event.iov.iov_base, &event.event,
                    sizeof(struct vtinput_event));
                vq_relchain(vq, event.idx, sizeof(struct vtinput_event));
        }
done:
        /* clear queue and send interrupt to guest */
        vtinput_eventqueue_clear(queue);
        vq_endchains(vq, 1);
}

static int
vtinput_read_event_from_host(int fd, struct input_event *event)
{
        const int len = read(fd, event, sizeof(struct input_event));
        if (len != sizeof(struct input_event)) {
                if (len == -1 && errno != EAGAIN) {
                        WPRINTF(("%s: event read failed! len = %d, errno = %d",
                            __func__, len, errno));
                }

                /* host doesn't have more events for us */
                return (1);
        }

        return (0);
}

static void
vtinput_read_event(int fd __attribute((unused)),
    enum ev_type t __attribute__((unused)), void *arg __attribute__((unused)))
{
        struct pci_vtinput_softc *sc = arg;

        /* skip if driver isn't ready */
        if (!(sc->vsc_vs.vs_status & VIRTIO_CONFIG_STATUS_DRIVER_OK))
                return;

        /* read all events from host */
        struct input_event event;
        while (vtinput_read_event_from_host(sc->vsc_fd, &event) == 0) {
                /* add events to our queue */
                vtinput_eventqueue_add_event(&sc->vsc_eventqueue, &event);

                /* only send events to guest on EV_SYN or SYN_REPORT */
                if (event.type != EV_SYN || event.type != SYN_REPORT) {
                        continue;
                }

                /* send host events to guest */
                vtinput_eventqueue_send_events(
                    &sc->vsc_eventqueue, &sc->vsc_queues[VTINPUT_EVENTQ]);
        }
}

static int
pci_vtinput_legacy_config(nvlist_t *nvl, const char *opts)
{
        if (opts == NULL)
                return (-1);

        /*
         * parse opts:
         *   virtio-input,/dev/input/eventX
         */
        char *cp = strchr(opts, ',');
        if (cp == NULL) {
                set_config_value_node(nvl, "path", opts);
                return (0);
        }
        char *path = strndup(opts, cp - opts);
        set_config_value_node(nvl, "path", path);
        free(path);

        return (pci_parse_legacy_config(nvl, cp + 1));
}

static int
pci_vtinput_init(struct pci_devinst *pi, nvlist_t *nvl)
{
        struct pci_vtinput_softc *sc;

        /*
         * Keep it here.
         * Else it's possible to access it uninitialized by jumping to failed.
         */
        pthread_mutexattr_t mtx_attr = NULL;

        sc = calloc(1, sizeof(struct pci_vtinput_softc));

        sc->vsc_evdev = get_config_value_node(nvl, "path");
        if (sc->vsc_evdev == NULL) {
                WPRINTF(("%s: missing required path config value", __func__));
                goto failed;
        }

        /*
         * open evdev by using non blocking I/O:
         *   read from /dev/input/eventX would block our thread otherwise
         */
        sc->vsc_fd = open(sc->vsc_evdev, O_RDWR | O_NONBLOCK);
        if (sc->vsc_fd < 0) {
                WPRINTF(("%s: failed to open %s", __func__, sc->vsc_evdev));
                goto failed;
        }

        /* check if evdev is really a evdev */
        int evversion;
        int error = ioctl(sc->vsc_fd, EVIOCGVERSION, &evversion);
        if (error < 0) {
                WPRINTF(("%s: %s is no evdev", __func__, sc->vsc_evdev));
                goto failed;
        }

        /* gain exclusive access to evdev */
        error = ioctl(sc->vsc_fd, EVIOCGRAB, 1);
        if (error < 0) {
                WPRINTF(("%s: failed to grab %s", __func__, sc->vsc_evdev));
                goto failed;
        }

        if (pthread_mutexattr_init(&mtx_attr)) {
                WPRINTF(("%s: init mutexattr failed", __func__));
                goto failed;
        }
        if (pthread_mutexattr_settype(&mtx_attr, PTHREAD_MUTEX_RECURSIVE)) {
                WPRINTF(("%s: settype mutexattr failed", __func__));
                goto failed;
        }
        if (pthread_mutex_init(&sc->vsc_mtx, &mtx_attr)) {
                WPRINTF(("%s: init mutex failed", __func__));
                goto failed;
        }

        /* init softc */
        sc->vsc_eventqueue.idx = 0;
        sc->vsc_eventqueue.size = VTINPUT_MAX_PKT_LEN;
        sc->vsc_eventqueue.events = calloc(
            sc->vsc_eventqueue.size, sizeof(struct vtinput_event_elem));
        sc->vsc_config_valid = 0;
        if (sc->vsc_eventqueue.events == NULL) {
                WPRINTF(("%s: failed to alloc eventqueue", __func__));
                goto failed;
        }

        /* register event handler */
        sc->vsc_evp = mevent_add(sc->vsc_fd, EVF_READ, vtinput_read_event, sc);
        if (sc->vsc_evp == NULL) {
                WPRINTF(("%s: could not register mevent", __func__));
                goto failed;
        }

#ifndef WITHOUT_CAPSICUM
        cap_rights_t rights;
        cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ, CAP_WRITE);
        if (caph_rights_limit(sc->vsc_fd, &rights) == -1) {
                errx(EX_OSERR, "Unable to apply rights for sandbox");
        }
#endif

        /* link virtio to softc */
        vi_softc_linkup(
            &sc->vsc_vs, &vtinput_vi_consts, sc, pi, sc->vsc_queues);
        sc->vsc_vs.vs_mtx = &sc->vsc_mtx;

        /* init virtio queues */
        sc->vsc_queues[VTINPUT_EVENTQ].vq_qsize = VTINPUT_RINGSZ;
        sc->vsc_queues[VTINPUT_EVENTQ].vq_notify = pci_vtinput_notify_eventq;
        sc->vsc_queues[VTINPUT_STATUSQ].vq_qsize = VTINPUT_RINGSZ;
        sc->vsc_queues[VTINPUT_STATUSQ].vq_notify = pci_vtinput_notify_statusq;

        /* initialize config space */
        pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_INPUT);
        pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
        pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_INPUTDEV);
        pci_set_cfgdata8(pi, PCIR_SUBCLASS, PCIS_INPUTDEV_OTHER);
        pci_set_cfgdata8(pi, PCIR_REVID, VIRTIO_REV_INPUT);
        pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_SUBDEV_INPUT);
        pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_SUBVEN_INPUT);

        /* add MSI-X table BAR */
        if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix()))
                goto failed;
        /* add virtio register */
        vi_set_io_bar(&sc->vsc_vs, 0);

        return (0);

failed:
        if (sc == NULL) {
                return (-1);
        }

        if (sc->vsc_evp)
                mevent_delete(sc->vsc_evp);
        if (sc->vsc_eventqueue.events)
                free(sc->vsc_eventqueue.events);
        if (sc->vsc_mtx)
                pthread_mutex_destroy(&sc->vsc_mtx);
        if (mtx_attr)
                pthread_mutexattr_destroy(&mtx_attr);
        if (sc->vsc_fd)
                close(sc->vsc_fd);

        free(sc);

        return (-1);
}

static const struct pci_devemu pci_de_vinput = {
        .pe_emu = "virtio-input",
        .pe_init = pci_vtinput_init,
        .pe_legacy_config = pci_vtinput_legacy_config,
        .pe_barwrite = vi_pci_write,
        .pe_barread = vi_pci_read,
};
PCI_EMUL_SET(pci_de_vinput);