binder: convert BINDER_* ioctl #defines into an enum

bindgen (a tool which generates the "raw" C bindings for Rust) only
works (so far) with "simple" C `#define`s. In order to avoid having
to manually maintain these constants in the (potential) Rust side,
this patch converts them into an `enum`.

There may be support in the future for expanding macros that end up in
a "numeric" one: rust-lang/rust-bindgen#753.

Co-developed-by: Wedson Almeida Filho <[email protected]>
Signed-off-by: Wedson Almeida Filho <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

include/uapi/linux/android/binder.h

@@ -236,19 +236,21 @@ struct binder_frozen_status_info {
 	__u32            async_recv;
 };
 
-#define BINDER_WRITE_READ		_IOWR('b', 1, struct binder_write_read)
-#define BINDER_SET_IDLE_TIMEOUT		_IOW('b', 3, __s64)
-#define BINDER_SET_MAX_THREADS		_IOW('b', 5, __u32)
-#define BINDER_SET_IDLE_PRIORITY	_IOW('b', 6, __s32)
-#define BINDER_SET_CONTEXT_MGR		_IOW('b', 7, __s32)
-#define BINDER_THREAD_EXIT		_IOW('b', 8, __s32)
-#define BINDER_VERSION			_IOWR('b', 9, struct binder_version)
-#define BINDER_GET_NODE_DEBUG_INFO	_IOWR('b', 11, struct binder_node_debug_info)
-#define BINDER_GET_NODE_INFO_FOR_REF	_IOWR('b', 12, struct binder_node_info_for_ref)
-#define BINDER_SET_CONTEXT_MGR_EXT	_IOW('b', 13, struct flat_binder_object)
-#define BINDER_FREEZE			_IOW('b', 14, struct binder_freeze_info)
-#define BINDER_GET_FROZEN_INFO		_IOWR('b', 15, struct binder_frozen_status_info)
-#define BINDER_ENABLE_ONEWAY_SPAM_DETECTION	_IOW('b', 16, __u32)
+enum {
+	BINDER_WRITE_READ			= _IOWR('b', 1, struct binder_write_read),
+	BINDER_SET_IDLE_TIMEOUT			= _IOW('b', 3, __s64),
+	BINDER_SET_MAX_THREADS			= _IOW('b', 5, __u32),
+	BINDER_SET_IDLE_PRIORITY		= _IOW('b', 6, __s32),
+	BINDER_SET_CONTEXT_MGR			= _IOW('b', 7, __s32),
+	BINDER_THREAD_EXIT			= _IOW('b', 8, __s32),
+	BINDER_VERSION				= _IOWR('b', 9, struct binder_version),
+	BINDER_GET_NODE_DEBUG_INFO		= _IOWR('b', 11, struct binder_node_debug_info),
+	BINDER_GET_NODE_INFO_FOR_REF		= _IOWR('b', 12, struct binder_node_info_for_ref),
+	BINDER_SET_CONTEXT_MGR_EXT		= _IOW('b', 13, struct flat_binder_object),
+	BINDER_FREEZE				= _IOW('b', 14, struct binder_freeze_info),
+	BINDER_GET_FROZEN_INFO			= _IOWR('b', 15, struct binder_frozen_status_info),
+	BINDER_ENABLE_ONEWAY_SPAM_DETECTION	= _IOW('b', 16, __u32),
+};
 
 /*
  * NOTE: Two special error codes you should check for when calling