[Qemu-devel] [PATCH 3/3] qdev-properties: add PROP_TYPE_ENUM

[Alon Levy <alevy@redhat.com>]

Example usage:

EnumTable foo_enum_table[] = {
    {"bar", 1},
    {"buz", 2},
    {NULL, 0},
};

DEFINE_PROP_ENUM("foo", State, foo, 1, foo_enum_table)

When using qemu -device foodev,? it will appear as:
 foodev.foo=bar/buz
---
 hw/qdev-properties.c |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/qdev.h            |   15 ++++++++++++
 2 files changed, 75 insertions(+), 0 deletions(-)

diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index a493087..3157721 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -63,6 +63,66 @@ PropertyInfo qdev_prop_bit = {
     .print = print_bit,
 };
 
+/* --- Enumeration --- */
+/* Example usage:
+EnumTable foo_enum_table[] = {
+    {"bar", 1},
+    {"buz", 2},
+    {NULL, 0},
+};
+DEFINE_PROP_ENUM("foo", State, foo, 1, foo_enum_table),
+ */
+static int parse_enum(DeviceState *dev, Property *prop, const char *str)
+{
+    uint8_t *ptr = qdev_get_prop_ptr(dev, prop);
+    EnumTable *option = (EnumTable*)prop->data;
+
+    while (option->name != NULL) {
+        if (!strncmp(str, option->name, strlen(option->name))) {
+            *ptr = option->value;
+            return 0;
+        }
+        option++;
+    }
+    return -EINVAL;
+}
+
+static int print_enum(DeviceState *dev, Property *prop, char *dest, size_t len)
+{
+    uint32_t *p = qdev_get_prop_ptr(dev, prop);
+    EnumTable *option = (EnumTable*)prop->data;
+    while (option->name != NULL) {
+        if (*p == option->value) {
+            return snprintf(dest, len, "%s", option->name);
+        }
+        option++;
+    }
+    return 0;
+}
+
+static int print_enum_options(DeviceInfo *info, Property *prop, char *dest, size_t len)
+{
+    int ret = 0;
+    EnumTable *option = (EnumTable*)prop->data;
+    while (option->name != NULL) {
+        ret += snprintf(dest + ret, len - ret, "%s", option->name);
+        if (option[1].name != NULL) {
+            ret += snprintf(dest + ret, len - ret, "/");
+        }
+        option++;
+    }
+    return ret;
+}
+
+PropertyInfo qdev_prop_enum = {
+    .name  = "enum",
+    .type  = PROP_TYPE_ENUM,
+    .size  = sizeof(uint32_t),
+    .parse = parse_enum,
+    .print = print_enum,
+    .print_options = print_enum_options,
+};
+
 /* --- 8bit integer --- */
 
 static int parse_uint8(DeviceState *dev, Property *prop, const char *str)
diff --git a/hw/qdev.h b/hw/qdev.h
index f6d5279..26b3d9e 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -102,6 +102,7 @@ enum PropertyType {
     PROP_TYPE_VLAN,
     PROP_TYPE_PTR,
     PROP_TYPE_BIT,
+    PROP_TYPE_ENUM,
 };
 
 struct PropertyInfo {
@@ -121,6 +122,11 @@ typedef struct GlobalProperty {
     QTAILQ_ENTRY(GlobalProperty) next;
 } GlobalProperty;
 
+typedef struct EnumTable {
+    const char *name;
+    uint32_t    value;
+} EnumTable;
+
 /*** Board API.  This should go away once we have a machine config file.  ***/
 
 DeviceState *qdev_create(BusState *bus, const char *name);
@@ -237,6 +243,7 @@ extern PropertyInfo qdev_prop_drive;
 extern PropertyInfo qdev_prop_netdev;
 extern PropertyInfo qdev_prop_vlan;
 extern PropertyInfo qdev_prop_pci_devfn;
+extern PropertyInfo qdev_prop_enum;
 
 #define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
         .name      = (_name),                                    \
@@ -259,6 +266,14 @@ extern PropertyInfo qdev_prop_pci_devfn;
             + type_check(uint32_t,typeof_field(_state, _field)), \
         .defval    = (bool[]) { (_defval) },                     \
         }
+#define DEFINE_PROP_ENUM(_name, _state, _field, _defval, _options) {    \
+        .name      = (_name),                                           \
+        .info      = &(qdev_prop_enum),                                 \
+        .offset    = offsetof(_state, _field)                           \
+            + type_check(uint32_t,typeof_field(_state, _field)),        \
+        .defval    = (uint32_t[]) { (_defval) },                        \
+        .data      = (void*)(_options),                                 \
+        }
 
 #define DEFINE_PROP_UINT8(_n, _s, _f, _d)                       \
     DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint8, uint8_t)
-- 
1.7.3.4