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rtc: add a dynamic property for retrieving the date 

This really shows the power of dynamic object properties compared to qdev
static properties.

This property represents a complex structure who's format is preserved over the
wire.  This is enabled by visitors.

It also shows an entirely synthetic property that is not tied to device state.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2011-12-12 14:29:39 -06:00
parent d0c5be5870
commit 182970509b
1 changed files with 27 additions and 0 deletions
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27
hw/mc146818rtc.c
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@ -614,6 +614,29 @@ static const MemoryRegionOps cmos_ops = {
.old_portio = cmos_portio
};
// FIXME add int32 visitor
static void visit_type_int32(Visitor *v, int *value, const char *name, Error **errp)
{
int64_t val = *value;
visit_type_int(v, &val, name, errp);
}
static void rtc_get_date(DeviceState *dev, Visitor *v, void *opaque,
const char *name, Error **errp)
{
ISADevice *isa = DO_UPCAST(ISADevice, qdev, dev);
RTCState *s = DO_UPCAST(RTCState, dev, isa);
visit_start_struct(v, NULL, "struct tm", name, 0, errp);
visit_type_int32(v, &s->current_tm.tm_year, "tm_year", errp);
visit_type_int32(v, &s->current_tm.tm_mon, "tm_mon", errp);
visit_type_int32(v, &s->current_tm.tm_mday, "tm_mday", errp);
visit_type_int32(v, &s->current_tm.tm_hour, "tm_hour", errp);
visit_type_int32(v, &s->current_tm.tm_min, "tm_min", errp);
visit_type_int32(v, &s->current_tm.tm_sec, "tm_sec", errp);
visit_end_struct(v, errp);
}
static int rtc_initfn(ISADevice *dev)
{
RTCState *s = DO_UPCAST(RTCState, dev, dev);
@ -647,6 +670,10 @@ static int rtc_initfn(ISADevice *dev)
qdev_set_legacy_instance_id(&dev->qdev, base, 2);
qemu_register_reset(rtc_reset, s);
qdev_property_add(&s->dev.qdev, "date", "struct tm",
rtc_get_date, NULL, NULL, s, NULL);
return 0;
}