3 files changed, 32 insertions, 16 deletions
diff --git a/libhw_generic/include/libhw/generic/io.h b/libhw_generic/include/libhw/generic/io.h
new file mode 100644
index 0000000..681c5ef
--- /dev/null
+++ b/libhw_generic/include/libhw/generic/io.h
@@ -0,0 +1,29 @@
+/* libhw/generic/io.h - Device-independent I/O definitions
+ *
+ * Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+#ifndef _LIBHW_GENERIC_IO_H_
+#define _LIBHW_GENERIC_IO_H_
+
+#include <stddef.h>    /* for size_t */
+
+/* structs ********************************************************************/
+
+#if __unix__
+#include <sys/uio.h>
+#else
+struct iovec {
+	void    *iov_base;
+	size_t   iov_len;
+};
+#endif
+
+struct duplex_iovec {
+	void    *iov_read_dst;
+	void    *iov_write_src;
+	size_t   iov_len;
+};
+
+#endif /* _LIBHW_GENERIC_IO_H_ */
diff --git a/libhw_generic/include/libhw/generic/net.h b/libhw_generic/include/libhw/generic/net.h
index 8d81573..0386e12 100644
--- a/libhw_generic/include/libhw/generic/net.h
+++ b/libhw_generic/include/libhw/generic/net.h
@@ -13,16 +13,8 @@
 #include <stdint.h>    /* for uint{n}_t} */
 #include <sys/types.h> /* for ssize_t */
 
-#if __unix__
-#include <sys/uio.h>
-#else
-struct iovec {
-	void    *iov_base;
-	size_t   iov_len;
-};
-#endif
-
 #include <libobj/obj.h>
+#include <libhw/generic/io.h>
 
 /* Errnos *********************************************************************/
 
diff --git a/libhw_generic/include/libhw/generic/spi.h b/libhw_generic/include/libhw/generic/spi.h
index aeeca37..c97232a 100644
--- a/libhw_generic/include/libhw/generic/spi.h
+++ b/libhw_generic/include/libhw/generic/spi.h
@@ -10,6 +10,7 @@
 #include <stddef.h> /* for size_t */
 
 #include <libobj/obj.h>
+#include <libhw/generic/io.h>
 
 enum spi_mode {
 	SPI_MODE_0 = 0, /* clk_polarity=0 (idle low), clk_phase=0 (sample on rise) */
@@ -18,12 +19,6 @@ enum spi_mode {
 	SPI_MODE_3 = 3, /* clk_polarity=1 (idle high), clk_phase=1 (sample on fall) */
 };
 
-struct bidi_iovec {
-	void    *iov_read_dst;
-	void    *iov_write_src;
-	size_t   iov_len;
-};
-
 /* This API assumes that an SPI frame is a multiple of 8-bits.
  *
  * It is my understanding that this is a common constraint of SPI
@@ -37,7 +32,7 @@ struct bidi_iovec {
  * non-multiple-of-8 number of bits.
  */
 #define spi_LO_IFACE \
-	LO_FUNC(void, readwritev, const struct bidi_iovec *iov, int iovcnt)
+	LO_FUNC(void, readwritev, const struct duplex_iovec *iov, int iovcnt)
 LO_INTERFACE(spi)
 
 #endif /* _LIBHW_GENERIC_SPI_H_ */