#include "hw.h"
#include "virtio-channel.h"

typedef struct VirtConPortWatchdog {
    VirtConPort dev;
    QEMUTimer *timer;
    uint32_t timeout;
} VirtConPortWatchdog;

static void timer_expired(void *ptr)
{
    VirtConPortWatchdog *s = ptr;

    watchdog_perform_action();
    qemu_del_timer(s->timer);
}

static int watchdog_open(VirtConPort *dev)
{
    VirtConPortWatchdog *s = DO_UPCAST(VirtConPortWatchdog, dev, dev);

    qemu_mod_timer(s->timer, qemu_get_clock (vm_clock) +
                   s->timeout * get_ticks_per_sec());
}

static int watchdog_data(VirtConPort *dev, uint8_t *buf, int len)
{
    VirtConPortWatchdog *s = DO_UPCAST(VirtConPortWatchdog, dev, dev);

    qemu_mod_timer(s->timer, qemu_get_clock (vm_clock) +
                   s->timeout * get_ticks_per_sec());
}

static int watchdog_init(VirtConPort *dev)
{
    VirtConPortWatchdog *s = DO_UPCAST(VirtConPortWatchdog, dev, dev);

    s->dev.name = "org.qemu.watchdog";
    s->timer = qemu_new_timer(vm_clock, timer_expired, s);
}

VirtConPortInfo watchdog_info = {
    .qdev.name    = "vmch-watchdog",
    .qdev.size    = sizeof(VirtConPortWatchdog),
    .qdev.vmsd    = /* todo */,
    .qdev.reset   = /* todo */,
    .init         = watchdog_init,
    .guest_open   = watchdog_open,
    .data_for_you = watchdog_data,
    .qdev.props   = (Property[]) {
        DEFINE_PROP_UINT32("timeout", VirtConPortWatchdog, timeout, 120),
        DEFINE_PROP_END_OF_LIST
    },
};

void watchdog_register(void)
{
    virtcon_port_qdev_register(&watchdog_info);
}
device_init(watchdog_register)