drivers/virtio: add virtio input driver

Signed-off-by: liuhongchao <liuhongchao@xiaomi.com>

drivers/virtio/Kconfig

@@ -33,6 +33,11 @@ config DRIVERS_VIRTIO_GPU
 	depends on VIDEO_FB
 	select FB_UPDATE
 
+config DRIVERS_VIRTIO_INPUT
+	bool "Virtio input support"
+	default n
+	depends on INPUT
+
 config DRIVERS_VIRTIO_NET
 	bool "Virtio network support"
 	depends on NETDEVICES

drivers/virtio/Make.defs

@@ -36,6 +36,10 @@ ifeq ($(CONFIG_DRIVERS_VIRTIO_GPU),y)
   CSRCS += virtio-gpu.c
 endif
 
+ifeq ($(CONFIG_DRIVERS_VIRTIO_INPUT),y)
+  CSRCS += virtio-input.c
+endif
+
 ifeq ($(CONFIG_DRIVERS_VIRTIO_NET),y)
   CSRCS += virtio-net.c
 endif

drivers/virtio/virtio-input.h

@@ -0,0 +1,112 @@
+/****************************************************************************
+ * drivers/virtio/virtio-input.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __DRIVERS_VIRTIO_VIRTIO_INPUT_H
+#define __DRIVERS_VIRTIO_VIRTIO_INPUT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <stdint.h>
+
+#ifdef CONFIG_DRIVERS_VIRTIO_INPUT
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define VIRTIO_INPUT_CFG_UNSET       0x00
+#define VIRTIO_INPUT_CFG_ID_NAME     0x01
+#define VIRTIO_INPUT_CFG_ID_SERIAL   0x02
+#define VIRTIO_INPUT_CFG_ID_DEVIDS   0x03
+#define VIRTIO_INPUT_CFG_PROP_BITS   0x10
+#define VIRTIO_INPUT_CFG_EV_BITS     0x11
+#define VIRTIO_INPUT_CFG_ABS_INFO    0x12
+
+#define VIRTIO_INPUT_CHUNK_SIZE      128  /* 128 bytes per chunk */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+begin_packed_struct struct virtio_input_absinfo
+{
+  uint32_t min;
+  uint32_t max;
+  uint32_t fuzz;
+  uint32_t flat;
+  uint32_t res;
+} end_packed_struct;
+
+begin_packed_struct struct virtio_input_devids
+{
+  uint16_t bustype;
+  uint16_t vendor;
+  uint16_t product;
+  uint16_t version;
+} end_packed_struct;
+
+begin_packed_struct struct virtio_input_config
+{
+  uint8_t select;
+  uint8_t subsel;
+  uint8_t size;
+  uint8_t reserved[5];
+  union
+  {
+    char                        string[VIRTIO_INPUT_CHUNK_SIZE];
+    uint8_t                     bitmap[VIRTIO_INPUT_CHUNK_SIZE];
+    struct virtio_input_absinfo abs;
+    struct virtio_input_devids  ids;
+  } u;
+} end_packed_struct;
+
+begin_packed_struct struct virtio_input_event
+{
+  uint16_t type;
+  uint16_t code;
+  uint32_t value;
+} end_packed_struct;
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int virtio_register_input_driver(void);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_DRIVERS_VIRTIO_INPUT */
+
+#endif /* __DRIVERS_VIRTIO_VIRTIO_INPUT_H */

drivers/virtio/virtio.c

@@ -30,6 +30,7 @@
 
 #include "virtio-blk.h"
 #include "virtio-gpu.h"
+#include "virtio-input.h"
 #include "virtio-net.h"
 #include "virtio-rng.h"
 #include "virtio-serial.h"
@@ -135,6 +136,14 @@ void virtio_register_drivers(void)
     }
 #endif
 
+#ifdef CONFIG_DRIVERS_VIRTIO_INPUT
+  ret = virtio_register_input_driver();
+  if (ret < 0)
+    {
+      vrterr("virtio_register_input_driver failed, ret=%d\n", ret);
+    }
+#endif
+
 #ifdef CONFIG_DRIVERS_VIRTIO_NET
   ret = virtio_register_net_driver();
   if (ret < 0)