Add common BusState

Implement and use a common device bus state.  The main side-effect is
that creating a bus and attaching it to a parent device are no longer
separate operations.  For legacy code we allow a NULL parent, but that
should go away eventually.

Also tweak creation code to veriry theat a device in on the right bus.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 19 insertions, 16 deletions

diff --git a/hw/i2c.c b/hw/i2c.c
index ce9de29..8a0c4d7 100644
--- a/hw/i2c.c
+++ b/hw/i2c.c
@@ -11,6 +11,7 @@
 
 struct i2c_bus
 {
+    BusState qbus;
     i2c_slave *current_dev;
     i2c_slave *dev;
     int saved_address;
@@ -39,11 +40,12 @@ static int i2c_bus_load(QEMUFile *f, void *opaque, int version_id)
 }
 
 /* Create a new I2C bus.  */
-i2c_bus *i2c_init_bus(void)
+i2c_bus *i2c_init_bus(DeviceState *parent, const char *name)
 {
     i2c_bus *bus;
 
-    bus = (i2c_bus *)qemu_mallocz(sizeof(i2c_bus));
+    bus = FROM_QBUS(i2c_bus, qbus_create(BUS_TYPE_I2C, sizeof(i2c_bus),
+                                         parent, name));
     register_savevm("i2c_bus", -1, 1, i2c_bus_save, i2c_bus_load, bus);
     return bus;
 }
@@ -63,20 +65,22 @@ int i2c_bus_busy(i2c_bus *bus)
 /* TODO: Make this handle multiple masters.  */
 int i2c_start_transfer(i2c_bus *bus, int address, int recv)
 {
-    i2c_slave *dev;
+    DeviceState *qdev;
+    i2c_slave *slave = NULL;
 
-    for (dev = bus->dev; dev; dev = dev->next) {
-        if (dev->address == address)
+    LIST_FOREACH(qdev, &bus->qbus.children, sibling) {
+        slave = I2C_SLAVE_FROM_QDEV(qdev);
+        if (slave->address == address)
             break;
     }
 
-    if (!dev)
+    if (!slave)
         return 1;
 
     /* If the bus is already busy, assume this is a repeated
        start condition.  */
-    bus->current_dev = dev;
-    dev->info->event(dev, recv ? I2C_START_RECV : I2C_START_SEND);
+    bus->current_dev = slave;
+    slave->info->event(slave, recv ? I2C_START_RECV : I2C_START_SEND);
     return 0;
 }
 
@@ -130,23 +134,20 @@ void i2c_slave_save(QEMUFile *f, i2c_slave *dev)
 void i2c_slave_load(QEMUFile *f, i2c_slave *dev)
 {
     i2c_bus *bus;
-    bus = qdev_get_bus(&dev->qdev);
+    bus = FROM_QBUS(i2c_bus, qdev_get_parent_bus(&dev->qdev));
     dev->address = qemu_get_byte(f);
     if (bus->saved_address == dev->address) {
         bus->current_dev = dev;
     }
 }
 
-static void i2c_slave_qdev_init(DeviceState *dev, void *opaque)
+static void i2c_slave_qdev_init(DeviceState *dev, DeviceInfo *base)
 {
-    I2CSlaveInfo *info = opaque;
+    I2CSlaveInfo *info = container_of(base, I2CSlaveInfo, qdev);
     i2c_slave *s = I2C_SLAVE_FROM_QDEV(dev);
 
     s->info = info;
-    s->bus = qdev_get_bus(dev);
     s->address = qdev_get_prop_int(dev, "address", 0);
-    s->next = s->bus->dev;
-    s->bus->dev = s;
 
     info->init(s);
 }
@@ -154,14 +155,16 @@ static void i2c_slave_qdev_init(DeviceState *dev, void *opaque)
 void i2c_register_slave(const char *name, int size, I2CSlaveInfo *info)
 {
     assert(size >= sizeof(i2c_slave));
-    qdev_register(name, size, i2c_slave_qdev_init, info);
+    info->qdev.init = i2c_slave_qdev_init;
+    info->qdev.bus_type = BUS_TYPE_I2C;
+    qdev_register(name, size, &info->qdev);
 }
 
 DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, int addr)
 {
     DeviceState *dev;
 
-    dev = qdev_create(bus, name);
+    dev = qdev_create(&bus->qbus, name);
     qdev_set_prop_int(dev, "address", addr);
     qdev_init(dev);
     return dev;