[fixed]serial_v2.c兼容DFS_V2接口 (#9153)

components/drivers/serial/serial_v2.c

@@ -118,7 +118,11 @@ static int serial_fops_ioctl(struct dfs_file *fd, int cmd, void *args)
     return rt_device_control(device, cmd, args);
 }
 
-static int serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
+#ifdef RT_USING_DFS_V2
+static ssize_t serial_fops_read(struct dfs_file *fd, void *buf, size_t count, off_t *pos)
+#else
+static ssize_t serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
+#endif
 {
     int size = 0;
     rt_device_t device;
@@ -143,7 +147,11 @@ static int serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
     return size;
 }
 
-static int serial_fops_write(struct dfs_file *fd, const void *buf, size_t count)
+#ifdef RT_USING_DFS_V2
+static ssize_t serial_fops_write(struct dfs_file *fd, const void *buf, size_t count, off_t *pos)
+#else
+static ssize_t serial_fops_write(struct dfs_file *fd, const void *buf, size_t count)
+#endif
 {
     rt_device_t device;
 
@@ -186,15 +194,12 @@ static int serial_fops_poll(struct dfs_file *fd, struct rt_pollreq *req)
 
 const static struct dfs_file_ops _serial_fops =
 {
-    serial_fops_open,
-    serial_fops_close,
-    serial_fops_ioctl,
-    serial_fops_read,
-    serial_fops_write,
-    RT_NULL, /* flush */
-    RT_NULL, /* lseek */
-    RT_NULL, /* getdents */
-    serial_fops_poll,
+    .open  = serial_fops_open,
+    .close = serial_fops_close,
+    .ioctl = serial_fops_ioctl,
+    .read  = serial_fops_read,
+    .write = serial_fops_write,
+    .poll  = serial_fops_poll,
 };
 #endif /* RT_USING_POSIX_STDIO */