[RFC,v4,06/12] parallel: Implement ISA set_state callback

diff --git a/hw/parallel.c b/hw/parallel.c
index cc853a5..0cfc697 100644
--- a/hw/parallel.c
+++ b/hw/parallel.c
@@ -446,6 +446,50 @@  static void parallel_reset(void *opaque)
     s->last_read_offset = ~0U;
 }
 
+static int parallel_isa_statefn(ISADevice *dev, bool enabled)
+{
+    ISAParallelState *isa = DO_UPCAST(ISAParallelState, dev, dev);
+    ParallelState *s = &isa->state;
+    int base;
+
+    base = isa->iobase;
+    if (enabled) {
+        isa_init_irq(dev, &s->irq, isa->isairq);
+
+        if (s->hw_driver) {
+            register_ioport_write(base, 8, 1, parallel_ioport_write_hw, s);
+            register_ioport_read(base, 8, 1, parallel_ioport_read_hw, s);
+            isa_init_ioport_range(dev, base, 8);
+
+            register_ioport_write(base + 4, 1, 2, parallel_ioport_eppdata_write_hw2, s);
+            register_ioport_read(base + 4, 1, 2, parallel_ioport_eppdata_read_hw2, s);
+            register_ioport_write(base + 4, 1, 4, parallel_ioport_eppdata_write_hw4, s);
+            register_ioport_read(base + 4, 1, 4, parallel_ioport_eppdata_read_hw4, s);
+            isa_init_ioport(dev, base + 4);
+            register_ioport_write(base + 0x400, 8, 1, parallel_ioport_ecp_write, s);
+            register_ioport_read(base + 0x400, 8, 1, parallel_ioport_ecp_read, s);
+            isa_init_ioport_range(dev, base + 0x400, 8);
+        }
+        else {
+            register_ioport_write(base, 8, 1, parallel_ioport_write_sw, s);
+            register_ioport_read(base, 8, 1, parallel_ioport_read_sw, s);
+            isa_init_ioport_range(dev, base, 8);
+        }
+    } else {
+        isa_discard_irq(dev, isa->isairq);
+
+        isa_discard_ioport_range(dev, base, 8);
+        isa_unassign_ioport(base, 8);
+        if (s->hw_driver) {
+            isa_discard_ioport_range(dev, base + 4, 1);
+            isa_unassign_ioport(base + 4, 1);
+            isa_discard_ioport_range(dev, base + 0x400, 8);
+            isa_unassign_ioport(base + 0x400, 8);
+        }
+    }
+    return 0;
+}
+
 static const int isa_parallel_io[MAX_PARALLEL_PORTS] = { 0x378, 0x278, 0x3bc };
 
 static int parallel_isa_initfn(ISADevice *dev)
@@ -453,7 +497,6 @@  static int parallel_isa_initfn(ISADevice *dev)
     static int index;
     ISAParallelState *isa = DO_UPCAST(ISAParallelState, dev, dev);
     ParallelState *s = &isa->state;
-    int base;
     uint8_t dummy;
 
     if (!s->chr) {
@@ -469,8 +512,6 @@  static int parallel_isa_initfn(ISADevice *dev)
         isa->iobase = isa_parallel_io[isa->index];
     index++;
 
-    base = isa->iobase;
-    isa_init_irq(dev, &s->irq, isa->isairq);
     qemu_register_reset(parallel_reset, s);
 
     if (qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0) {
@@ -478,25 +519,7 @@  static int parallel_isa_initfn(ISADevice *dev)
         s->status = dummy;
     }
 
-    if (s->hw_driver) {
-        register_ioport_write(base, 8, 1, parallel_ioport_write_hw, s);
-        register_ioport_read(base, 8, 1, parallel_ioport_read_hw, s);
-        isa_init_ioport_range(dev, base, 8);
-
-        register_ioport_write(base+4, 1, 2, parallel_ioport_eppdata_write_hw2, s);
-        register_ioport_read(base+4, 1, 2, parallel_ioport_eppdata_read_hw2, s);
-        register_ioport_write(base+4, 1, 4, parallel_ioport_eppdata_write_hw4, s);
-        register_ioport_read(base+4, 1, 4, parallel_ioport_eppdata_read_hw4, s);
-        isa_init_ioport(dev, base+4);
-        register_ioport_write(base+0x400, 8, 1, parallel_ioport_ecp_write, s);
-        register_ioport_read(base+0x400, 8, 1, parallel_ioport_ecp_read, s);
-        isa_init_ioport_range(dev, base+0x400, 8);
-    }
-    else {
-        register_ioport_write(base, 8, 1, parallel_ioport_write_sw, s);
-        register_ioport_read(base, 8, 1, parallel_ioport_read_sw, s);
-        isa_init_ioport_range(dev, base, 8);
-    }
+    parallel_isa_statefn(dev, true);
     return 0;
 }
 
@@ -581,11 +604,13 @@  static ISADeviceInfo parallel_isa_info = {
     .qdev.name  = "isa-parallel",
     .qdev.size  = sizeof(ISAParallelState),
     .init       = parallel_isa_initfn,
+    .set_state  = parallel_isa_statefn,
     .qdev.props = (Property[]) {
         DEFINE_PROP_UINT32("index", ISAParallelState, index,   -1),
         DEFINE_PROP_HEX32("iobase", ISAParallelState, iobase,  -1),
         DEFINE_PROP_UINT32("irq",   ISAParallelState, isairq,  7),
         DEFINE_PROP_CHR("chardev",  ISAParallelState, state.chr),
+        DEFINE_PROP_BOOL("enabled", ISAParallelState, dev.enabled, true),
         DEFINE_PROP_END_OF_LIST(),
     },
 };