audio/via-ac97: Simplify code and set user_creatable to false

Remove some unneded, empty code and set user_creatable to false
(besides being not implemented yet, so does nothing anyway) it's also
normally part of VIA south bridge chips so no need to confuse users
showing them these devices.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <c7a5b1ee4c02e304ff70ebfbf269544f3c1f8412.1609584216.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/audio/via-ac97.c

@@ -13,27 +13,13 @@
 #include "hw/isa/vt82c686.h"
 #include "hw/pci/pci.h"
 
-struct VIAAC97State {
-    PCIDevice dev;
-};
-
-struct VIAMC97State {
-    PCIDevice dev;
-};
-
-OBJECT_DECLARE_SIMPLE_TYPE(VIAAC97State, VIA_AC97)
-OBJECT_DECLARE_SIMPLE_TYPE(VIAMC97State, VIA_MC97)
-
-static void via_ac97_realize(PCIDevice *dev, Error **errp)
+static void via_ac97_realize(PCIDevice *pci_dev, Error **errp)
 {
-    VIAAC97State *s = VIA_AC97(dev);
-    uint8_t *pci_conf = s->dev.config;
-
-    pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_INVALIDATE |
-                 PCI_COMMAND_PARITY);
-    pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_CAP_LIST |
-                 PCI_STATUS_DEVSEL_MEDIUM);
-    pci_set_long(pci_conf + PCI_INTERRUPT_PIN, 0x03);
+    pci_set_word(pci_dev->config + PCI_COMMAND,
+                 PCI_COMMAND_INVALIDATE | PCI_COMMAND_PARITY);
+    pci_set_word(pci_dev->config + PCI_STATUS,
+                 PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_MEDIUM);
+    pci_set_long(pci_dev->config + PCI_INTERRUPT_PIN, 0x03);
 }
 
 static void via_ac97_class_init(ObjectClass *klass, void *data)
@@ -47,13 +33,15 @@ static void via_ac97_class_init(ObjectClass *klass, void *data)
     k->revision = 0x50;
     k->class_id = PCI_CLASS_MULTIMEDIA_AUDIO;
     set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
-    dc->desc = "AC97";
+    dc->desc = "VIA AC97";
+    /* Reason: Part of a south bridge chip */
+    dc->user_creatable = false;
 }
 
 static const TypeInfo via_ac97_info = {
     .name          = TYPE_VIA_AC97,
     .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VIAAC97State),
+    .instance_size = sizeof(PCIDevice),
     .class_init    = via_ac97_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
@@ -61,15 +49,12 @@ static const TypeInfo via_ac97_info = {
     },
 };
 
-static void via_mc97_realize(PCIDevice *dev, Error **errp)
+static void via_mc97_realize(PCIDevice *pci_dev, Error **errp)
 {
-    VIAMC97State *s = VIA_MC97(dev);
-    uint8_t *pci_conf = s->dev.config;
-
-    pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_INVALIDATE |
-                 PCI_COMMAND_VGA_PALETTE);
-    pci_set_word(pci_conf + PCI_STATUS, PCI_STATUS_DEVSEL_MEDIUM);
-    pci_set_long(pci_conf + PCI_INTERRUPT_PIN, 0x03);
+    pci_set_word(pci_dev->config + PCI_COMMAND,
+                 PCI_COMMAND_INVALIDATE | PCI_COMMAND_VGA_PALETTE);
+    pci_set_word(pci_dev->config + PCI_STATUS, PCI_STATUS_DEVSEL_MEDIUM);
+    pci_set_long(pci_dev->config + PCI_INTERRUPT_PIN, 0x03);
 }
 
 static void via_mc97_class_init(ObjectClass *klass, void *data)
@@ -83,13 +68,15 @@ static void via_mc97_class_init(ObjectClass *klass, void *data)
     k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
     k->revision = 0x30;
     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
-    dc->desc = "MC97";
+    dc->desc = "VIA MC97";
+    /* Reason: Part of a south bridge chip */
+    dc->user_creatable = false;
 }
 
 static const TypeInfo via_mc97_info = {
     .name          = TYPE_VIA_MC97,
     .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VIAMC97State),
+    .instance_size = sizeof(PCIDevice),
     .class_init    = via_mc97_class_init,
     .interfaces = (InterfaceInfo[]) {
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },