linux-kernel - [PATCH 3.16 051/134] iio: proximity: as3935: fix as3935

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Message-ID: <lsq.1503062000.206180190@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Jonathan Cameron" <jic23@...nel.org>,
        "George McCollister" <george.mccollister@...il.com>,
        "Matt Ranostay" <matt.ranostay@...sulko.com>
Subject: [PATCH 3.16 051/134] iio: proximity: as3935: fix as3935_write

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Matt Ranostay <matt.ranostay@...sulko.com>

commit 84ca8e364acb26aba3292bc113ca8ed4335380fd upstream.

AS3935_WRITE_DATA macro bit is incorrect and the actual write
sequence is two leading zeros.

Cc: George McCollister <george.mccollister@...il.com>
Signed-off-by: Matt Ranostay <matt.ranostay@...sulko.com>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iio/proximity/as3935.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/iio/proximity/as3935.c
+++ b/drivers/iio/proximity/as3935.c
@@ -50,7 +50,6 @@
 #define AS3935_TUNE_CAP		0x08
 #define AS3935_CALIBRATE	0x3D
 
-#define AS3935_WRITE_DATA	BIT(15)
 #define AS3935_READ_DATA	BIT(14)
 #define AS3935_ADDRESS(x)	((x) << 8)
 
@@ -105,7 +104,7 @@ static int as3935_write(struct as3935_st
 {
 	u8 *buf = st->buf;
 
-	buf[0] = (AS3935_WRITE_DATA | AS3935_ADDRESS(reg)) >> 8;
+	buf[0] = AS3935_ADDRESS(reg) >> 8;
 	buf[1] = val;
 
 	return spi_write(st->spi, buf, 2);