chardev: enable modules, use for braille

Removes brlapi library dependency from core qemu.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20200624131045.14512-11-kraxel@redhat.com

Makefile.objs

@@ -71,6 +71,7 @@ common-obj-$(CONFIG_TPM) += tpm.o
 
 common-obj-y += backends/
 common-obj-y += chardev/
+common-obj-m += chardev/
 
 common-obj-$(CONFIG_SECCOMP) += qemu-seccomp.o
 qemu-seccomp.o-cflags := $(SECCOMP_CFLAGS)

chardev/Makefile.objs

@@ -18,8 +18,11 @@ chardev-obj-$(CONFIG_WIN32) += char-win.o
 chardev-obj-$(CONFIG_WIN32) += char-win-stdio.o
 
 common-obj-y += msmouse.o wctablet.o testdev.o
-common-obj-$(CONFIG_BRLAPI) += baum.o
+
+ifeq ($(CONFIG_BRLAPI),y)
+common-obj-m += baum.o
 baum.o-cflags := $(SDL_CFLAGS)
 baum.o-libs := $(BRLAPI_LIBS)
+endif
 
 common-obj-$(CONFIG_SPICE) += spice.o

chardev/char.c

@@ -527,7 +527,7 @@ static const ChardevClass *char_get_class(const char *driver, Error **errp)
     const ChardevClass *cc;
     char *typename = g_strdup_printf("chardev-%s", driver);
 
-    oc = object_class_by_name(typename);
+    oc = module_object_class_by_name(typename);
     g_free(typename);
 
     if (!object_class_dynamic_cast(oc, TYPE_CHARDEV)) {

util/module.c

@@ -272,6 +272,7 @@ static struct {
     { "vhost-user-gpu-device", "hw-", "display-virtio-gpu"    },
     { "vhost-user-gpu-pci",    "hw-", "display-virtio-gpu"    },
     { "vhost-user-vga",        "hw-", "display-virtio-gpu"    },
+    { "chardev-braille",       "chardev-", "baum"             },
 };
 
 static bool module_loaded_qom_all;