From: Rui Miguel Silva <rui.silva@linaro.org>
Date: Wed, 2 Dec 2015 11:12:27 +0000 (+0000)
Subject: greybus: spi: add rdwr field to transfer descriptor
X-Git-Tag: v4.14-rc1~2366^2~378^2~21^2~978
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b455c84655d5bdfc5157d2100279e3ff2454b596;p=platform%2Fkernel%2Flinux-rpi.git

greybus: spi: add rdwr field to transfer descriptor

Add read and/or write field to transfer descriptor to make it possible
to identify the type of transfer.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
---

diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index 00593b0..23d4cce 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -695,6 +695,9 @@ struct gb_spi_transfer {
 	__le16		delay_usecs;
 	__u8		cs_change;
 	__u8		bits_per_word;
+	__u8		rdwr;
+#define GB_SPI_XFER_READ	0x01
+#define GB_SPI_XFER_WRITE	0x02
 } __packed;
 
 struct gb_spi_transfer_request {
diff --git a/drivers/staging/greybus/spi.c b/drivers/staging/greybus/spi.c
index 33e86f9..1b9c973 100644
--- a/drivers/staging/greybus/spi.c
+++ b/drivers/staging/greybus/spi.c
@@ -107,13 +107,16 @@ gb_spi_operation_create(struct gb_connection *connection,
 		gb_xfer->delay_usecs = cpu_to_le16(xfer->delay_usecs);
 		gb_xfer->cs_change = xfer->cs_change;
 		gb_xfer->bits_per_word = xfer->bits_per_word;
-		gb_xfer++;
 
 		/* Copy tx data */
 		if (xfer->tx_buf) {
 			memcpy(tx_data, xfer->tx_buf, xfer->len);
 			tx_data += xfer->len;
+			gb_xfer->rdwr |= GB_SPI_XFER_WRITE;
 		}
+		if (xfer->rx_buf)
+			gb_xfer->rdwr |= GB_SPI_XFER_READ;
+		gb_xfer++;
 	}
 
 	return operation;