spi_sync_transfer() and spi_message_init_with_transfers() are used by
the st-nci nfc driver.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/spi/spi.h | 49 +++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/backport/backport-include/linux/spi/spi.h b/backport/backport-include/linux/spi/spi.h
index 672cf5b..76fd8a2 100644
--- a/backport/backport-include/linux/spi/spi.h
+++ b/backport/backport-include/linux/spi/spi.h
@@ -17,4 +17,53 @@
spi_unregister_driver)
#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
+/**
+ * spi_message_init_with_transfers - Initialize spi_message and append transfers
+ * @m: spi_message to be initialized
+ * @xfers: An array of spi transfers
+ * @num_xfers: Number of items in the xfer array
+ *
+ * This function initializes the given spi_message and adds each spi_transfer in
+ * the given array to the message.
+ */
+#define spi_message_init_with_transfers LINUX_BACKPORT(spi_message_init_with_transfers)
+static inline void
+spi_message_init_with_transfers(struct spi_message *m,
+struct spi_transfer *xfers, unsigned int num_xfers)
+{
+ unsigned int i;
+
+ spi_message_init(m);
+ for (i = 0; i < num_xfers; ++i)
+ spi_message_add_tail(&xfers[i], m);
+}
+
+/**
+ * spi_sync_transfer - synchronous SPI data transfer
+ * @spi: device with which data will be exchanged
+ * @xfers: An array of spi_transfers
+ * @num_xfers: Number of items in the xfer array
+ * Context: can sleep
+ *
+ * Does a synchronous SPI data transfer of the given spi_transfer array.
+ *
+ * For more specific semantics see spi_sync().
+ *
+ * It returns zero on success, else a negative error code.
+ */
+#define spi_sync_transfer LINUX_BACKPORT(spi_sync_transfer)
+static inline int
+spi_sync_transfer(struct spi_device *spi, struct spi_transfer *xfers,
+ unsigned int num_xfers)
+{
+ struct spi_message msg;
+
+ spi_message_init_with_transfers(&msg, xfers, num_xfers);
+
+ return spi_sync(spi, &msg);
+}
+#endif /* < 3.9 */
+
#endif /* _BACKPORTS_LINUX_SPI_H */
--
2.1.4
--
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