From: kibak.yoon <kibak.yoon@samsung.com>
Date: Wed, 6 Sep 2017 08:12:02 +0000 (+0900)
Subject: spi: transfer the tx/rx data with the same structure variable
X-Git-Tag: submit/tizen_4.0/20170907.084141^0
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=447f5ca43552c877acc3dc17eb70fab82f0725ea;p=platform%2Fcore%2Fsystem%2Fperipheral-bus.git

spi: transfer the tx/rx data with the same structure variable

- Tested with ADC(MCP3008)
- The name of spi_read_write() function will be changed to "spi_transfer()".

Change-Id: I6db7383854de46c5e45721fb9ec9da6ce4a51c8f
Signed-off-by: kibak.yoon <kibak.yoon@samsung.com>
(cherry picked from commit 2c2412ce0706788c57fc1ffc3c2bd8834fc17a71)
---

diff --git a/src/interface/spi.c b/src/interface/spi.c
index 601be5c..50f4365 100644
--- a/src/interface/spi.c
+++ b/src/interface/spi.c
@@ -300,19 +300,18 @@ int spi_write(int fd, unsigned char *txbuf, int length)
 int spi_read_write(int fd, unsigned char *txbuf, unsigned char *rxbuf, int length)
 {
 	int status;
-	struct spi_ioc_transfer xfer[2];
+	struct spi_ioc_transfer xfer;
 
 	if (fd < 0) return -EINVAL;
 
 	if (!txbuf || !rxbuf || length < 0) return -EINVAL;
 
-	memset(xfer, 0, sizeof(xfer));
-	xfer[0].tx_buf = (unsigned long)txbuf;
-	xfer[0].len = length;
-	xfer[1].rx_buf = (unsigned long)rxbuf;
-	xfer[1].len = length;
+	memset(&xfer, 0, sizeof(xfer));
+	xfer.tx_buf = (unsigned long)txbuf;
+	xfer.rx_buf = (unsigned long)rxbuf;
+	xfer.len = length;
 
-	status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer);
+	status = ioctl(fd, SPI_IOC_MESSAGE(1), xfer);
 	if (status < 0) {
 		char errmsg[MAX_ERR_LEN];
 		strerror_r(errno, errmsg, MAX_ERR_LEN);