Record device property types

Record device property types, and provide a list of properties at device
registration time.

Add a "device" property type that holds a reference to annother device.
Signed-off-by: NPaul Brook <paul@codesourcery.com>

hw/qdev.c

@@ -32,6 +32,7 @@
 
 struct DeviceProperty {
     const char *name;
+    DevicePropType type;
     union {
         uint64_t i;
         void *ptr;
@@ -119,13 +120,15 @@ void qdev_free(DeviceState *dev)
     free(dev);
 }
 
-static DeviceProperty *create_prop(DeviceState *dev, const char *name)
+static DeviceProperty *create_prop(DeviceState *dev, const char *name,
+                                   DevicePropType type)
 {
     DeviceProperty *prop;
 
     /* TODO: Check for duplicate properties.  */
     prop = qemu_mallocz(sizeof(*prop));
     prop->name = qemu_strdup(name);
+    prop->type = type;
     prop->next = dev->props;
     dev->props = prop;
 
@@ -136,15 +139,23 @@ void qdev_set_prop_int(DeviceState *dev, const char *name, uint64_t value)
 {
     DeviceProperty *prop;
 
-    prop = create_prop(dev, name);
+    prop = create_prop(dev, name, PROP_TYPE_INT);
     prop->value.i = value;
 }
 
+void qdev_set_prop_dev(DeviceState *dev, const char *name, DeviceState *value)
+{
+    DeviceProperty *prop;
+
+    prop = create_prop(dev, name, PROP_TYPE_DEV);
+    prop->value.ptr = value;
+}
+
 void qdev_set_prop_ptr(DeviceState *dev, const char *name, void *value)
 {
     DeviceProperty *prop;
 
-    prop = create_prop(dev, name);
+    prop = create_prop(dev, name, PROP_TYPE_INT);
     prop->value.ptr = value;
 }
 
@@ -173,12 +184,14 @@ BusState *qdev_get_parent_bus(DeviceState *dev)
     return dev->parent_bus;
 }
 
-static DeviceProperty *find_prop(DeviceState *dev, const char *name)
+static DeviceProperty *find_prop(DeviceState *dev, const char *name,
+                                 DevicePropType type)
 {
     DeviceProperty *prop;
 
     for (prop = dev->props; prop; prop = prop->next) {
         if (strcmp(prop->name, name) == 0) {
+            assert (prop->type == type);
             return prop;
         }
     }
@@ -189,9 +202,10 @@ uint64_t qdev_get_prop_int(DeviceState *dev, const char *name, uint64_t def)
 {
     DeviceProperty *prop;
 
-    prop = find_prop(dev, name);
-    if (!prop)
+    prop = find_prop(dev, name, PROP_TYPE_INT);
+    if (!prop) {
         return def;
+    }
 
     return prop->value.i;
 }
@@ -200,11 +214,22 @@ void *qdev_get_prop_ptr(DeviceState *dev, const char *name)
 {
     DeviceProperty *prop;
 
-    prop = find_prop(dev, name);
+    prop = find_prop(dev, name, PROP_TYPE_PTR);
     assert(prop);
     return prop->value.ptr;
 }
 
+DeviceState *qdev_get_prop_dev(DeviceState *dev, const char *name)
+{
+    DeviceProperty *prop;
+
+    prop = find_prop(dev, name, PROP_TYPE_DEV);
+    if (!prop) {
+        return NULL;
+    }
+    return prop->value.ptr;
+}
+
 void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
 {
     assert(dev->num_gpio_in == 0);

hw/qdev.h

@@ -49,6 +49,7 @@ void qdev_free(DeviceState *dev);
 
 /* Set properties between creation and init.  */
 void qdev_set_prop_int(DeviceState *dev, const char *name, uint64_t value);
+void qdev_set_prop_dev(DeviceState *dev, const char *name, DeviceState *value);
 void qdev_set_prop_ptr(DeviceState *dev, const char *name, void *value);
 void qdev_set_netdev(DeviceState *dev, NICInfo *nd);
 
@@ -59,6 +60,17 @@ BusState *qdev_get_child_bus(DeviceState *dev, const char *name);
 
 /*** Device API.  ***/
 
+typedef enum {
+    PROP_TYPE_INT,
+    PROP_TYPE_PTR,
+    PROP_TYPE_DEV
+} DevicePropType;
+
+typedef struct {
+    const char *name;
+    DevicePropType type;
+} DevicePropList;
+
 typedef struct DeviceInfo DeviceInfo;
 
 typedef void (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
@@ -68,6 +80,7 @@ typedef void (*SCSIAttachFn)(DeviceState *host, BlockDriverState *bdrv,
 struct DeviceInfo {
     qdev_initfn init;
     BusType bus_type;
+    DevicePropList *props;
 };
 
 void qdev_register(const char *name, int size, DeviceInfo *info);
@@ -83,6 +96,8 @@ CharDriverState *qdev_init_chardev(DeviceState *dev);
 
 BusState *qdev_get_parent_bus(DeviceState *dev);
 uint64_t qdev_get_prop_int(DeviceState *dev, const char *name, uint64_t def);
+DeviceState *qdev_get_prop_dev(DeviceState *dev, const char *name);
+/* FIXME: Remove opaque pointer properties.  */
 void *qdev_get_prop_ptr(DeviceState *dev, const char *name);
 
 /* Convery from a base type to a parent type, with compile time checking.  */

hw/syborg_timer.c

@@ -226,10 +226,20 @@ static void syborg_timer_init(SysBusDevice *dev)
                     syborg_timer_save, syborg_timer_load, s);
 }
 
+static SysBusDeviceInfo syborg_timer_info = {
+    .init = syborg_timer_init,
+    .qdev = {
+        .props = (DevicePropList[]) {
+              {.name = "frequency", .type = PROP_TYPE_INT},
+              {.name = NULL}
+        }
+    }
+};
+
 static void syborg_timer_register_devices(void)
 {
-    sysbus_register_dev("syborg,timer", sizeof(SyborgTimerState),
-                        syborg_timer_init);
+    sysbus_register_withprop("syborg,timer", sizeof(SyborgTimerState),
+                            &syborg_timer_info);
 }
 
 device_init(syborg_timer_register_devices)

hw/sysbus.c

@@ -21,11 +21,6 @@
 #include "sysbus.h"
 #include "sysemu.h"
 
-typedef struct {
-    DeviceInfo qdev;
-    sysbus_initfn init;
-} SysBusDeviceInfo;
-
 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
 {
     assert(n >= 0 && n < dev->num_irq);
@@ -109,12 +104,9 @@ static void sysbus_device_init(DeviceState *dev, DeviceInfo *base)
     info->init(sysbus_from_qdev(dev));
 }
 
-void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init)
+void sysbus_register_withprop(const char *name, size_t size,
+                              SysBusDeviceInfo *info)
 {
-    SysBusDeviceInfo *info;
-
-    info = qemu_mallocz(sizeof(*info));
-    info->init = init;
     info->qdev.init = sysbus_device_init;
     info->qdev.bus_type = BUS_TYPE_SYSTEM;
 
@@ -122,6 +114,15 @@ void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init)
     qdev_register(name, size, &info->qdev);
 }
 
+void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init)
+{
+    SysBusDeviceInfo *info;
+
+    info = qemu_mallocz(sizeof(*info));
+    info->init = init;
+    sysbus_register_withprop(name, size, info);
+}
+
 DeviceState *sysbus_create_varargs(const char *name,
                                    target_phys_addr_t addr, ...)
 {

hw/sysbus.h

@@ -31,7 +31,14 @@ typedef void (*sysbus_initfn)(SysBusDevice *dev);
 #define sysbus_from_qdev(dev) ((SysBusDevice *)(dev))
 #define FROM_SYSBUS(type, dev) DO_UPCAST(type, busdev, dev)
 
+typedef struct {
+    DeviceInfo qdev;
+    sysbus_initfn init;
+} SysBusDeviceInfo;
+
 void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init);
+void sysbus_register_withprop(const char *name, size_t size,
+                              SysBusDeviceInfo *info);
 void *sysbus_new(void);
 void sysbus_init_mmio(SysBusDevice *dev, target_phys_addr_t size, int iofunc);
 void sysbus_init_mmio_cb(SysBusDevice *dev, target_phys_addr_t size,