qdev child bus support

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

hw/qdev.c

@@ -46,6 +46,12 @@ struct DeviceType {
     DeviceType *next;
 };
 
+struct ChildBusList {
+    const char *name;
+    void *ptr;
+    ChildBusList *next;
+};
+
 static DeviceType *device_type_list;
 
 /* Register a new device type.  */
@@ -235,3 +241,27 @@ BlockDriverState *qdev_init_bdrv(DeviceState *dev, BlockInterfaceType type)
     }
     return drives_table[index].bdrv;
 }
+
+void *qdev_get_child_bus(DeviceState *dev, const char *name)
+{
+    ChildBusList *bus;
+
+    for (bus = dev->child_bus; bus; bus = bus->next) {
+        if (strcmp(name, bus->name) == 0) {
+            return bus->ptr;
+        }
+    }
+    return NULL;
+}
+
+void qdev_attach_child_bus(DeviceState *dev, const char *name, void *bus)
+{
+    ChildBusList *p;
+
+    assert(!qdev_get_child_bus(dev, name));
+    p = qemu_mallocz(sizeof(*p));
+    p->name = qemu_strdup(name);
+    p->ptr = bus;
+    p->next = dev->child_bus;
+    dev->child_bus = p;
+}

hw/qdev.h

@@ -7,6 +7,8 @@ typedef struct DeviceType DeviceType;
 
 typedef struct DeviceProperty DeviceProperty;
 
+typedef struct ChildBusList ChildBusList;
+
 /* This structure should not be accessed directly.  We declare it here
    so that it can be embedded in individual device state structures.  */
 struct DeviceState
@@ -21,6 +23,7 @@ struct DeviceState
     qemu_irq *gpio_out;
     int num_gpio_in;
     qemu_irq *gpio_in;
+    ChildBusList *child_bus;
 };
 
 /*** Board API.  This should go away once we have a machine config file.  ***/
@@ -36,6 +39,8 @@ qemu_irq qdev_get_irq_sink(DeviceState *dev, int n);
 qemu_irq qdev_get_gpio_in(DeviceState *dev, int n);
 void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
 
+void *qdev_get_child_bus(DeviceState *dev, const char *name);
+
 /*** Device API.  ***/
 
 typedef void (*qdev_initfn)(DeviceState *dev, void *opaque);
@@ -47,6 +52,7 @@ DeviceType *qdev_register(const char *name, int size, qdev_initfn init,
 void qdev_init_irq_sink(DeviceState *dev, qemu_irq_handler handler, int nirq);
 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n);
 void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n);
+void qdev_attach_child_bus(DeviceState *dev, const char *name, void *bus);
 
 CharDriverState *qdev_init_chardev(DeviceState *dev);