[PATCH v4 1/3] hw/i2c: core: Add reset

[Joe Komlodi <komlodi@google.com>]

It's possible for a reset to come in the middle of a transaction, which
causes the bus to be in an old state when a new transaction comes in.

Signed-off-by: Joe Komlodi <komlodi@google.com>
---
 hw/i2c/core.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/hw/i2c/core.c b/hw/i2c/core.c
index 4cf30b2c86..3128067bba 100644
--- a/hw/i2c/core.c
+++ b/hw/i2c/core.c
@@ -23,10 +23,29 @@ static Property i2c_props[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
+static void i2c_bus_hold_reset(Object *obj)
+{
+    I2CBus *bus = I2C_BUS(obj);
+    I2CNode *node, *next;
+
+    bus->broadcast = false;
+    QLIST_FOREACH_SAFE(node, &bus->current_devs, next, next) {
+        QLIST_REMOVE(node, next);
+        g_free(node);
+    }
+}
+
+static void i2c_bus_class_init(ObjectClass *klass, void *data)
+{
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
+    rc->phases.hold = i2c_bus_hold_reset;
+}
+
 static const TypeInfo i2c_bus_info = {
     .name = TYPE_I2C_BUS,
     .parent = TYPE_BUS,
     .instance_size = sizeof(I2CBus),
+    .class_init = i2c_bus_class_init,
 };
 
 static int i2c_bus_pre_save(void *opaque)
-- 
2.44.0.rc0.258.g7320e95886-goog