[PATCH 2/5] hw/pcmcia/microdrive: Register machine reset handler

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

The abstract PCMCIA_CARD is a bus-less TYPE_DEVICE, so devices
implementing it are not reset automatically.
Register a reset handler so children get reset on machine reset.

Note, the DSCM-1XXXX device (TYPE_DSCM1XXXX) which inherits
TYPE_MICRODRIVE and PCMCIA_CARD reset itself when a disk is
attached or detached, but was not resetting itself on machine
reset.

It doesn't seem to be an issue because it is that way since the
device QDev'ifycation 8 years ago, in commit d1f2c96a81a
("pcmcia: QOM'ify PCMCIACardState and MicroDriveState").
Still, correct to have a proper API usage.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/pcmcia/pcmcia.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/hw/pcmcia/pcmcia.c b/hw/pcmcia/pcmcia.c
index 03d13e7d670..73656257227 100644
--- a/hw/pcmcia/pcmcia.c
+++ b/hw/pcmcia/pcmcia.c
@@ -6,14 +6,39 @@
 
 #include "qemu/osdep.h"
 #include "qemu/module.h"
+#include "sysemu/reset.h"
 #include "hw/pcmcia.h"
 
+static void pcmcia_card_reset_handler(void *dev)
+{
+    device_legacy_reset(DEVICE(dev));
+}
+
+static void pcmcia_card_realize(DeviceState *dev, Error **errp)
+{
+    qemu_register_reset(pcmcia_card_reset_handler, dev);
+}
+
+static void pcmcia_card_unrealize(DeviceState *dev)
+{
+    qemu_unregister_reset(pcmcia_card_reset_handler, dev);
+}
+
+static void pcmcia_card_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = pcmcia_card_realize;
+    dc->unrealize = pcmcia_card_unrealize;
+}
+
 static const TypeInfo pcmcia_card_type_info = {
     .name = TYPE_PCMCIA_CARD,
     .parent = TYPE_DEVICE,
     .instance_size = sizeof(PCMCIACardState),
     .abstract = true,
     .class_size = sizeof(PCMCIACardClass),
+    .class_init = pcmcia_card_class_init,
 };
 
 static void pcmcia_register_types(void)
-- 
2.26.3