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[01/17] staging:iio:adc:ad7280a: Fix handing of device address bit reversing.

Message ID 20210614113507.897732-2-jic23@kernel.org
State New
Headers show
Series iio:adc:ad7280a Cleanup and proposed staging graduation. | expand

Commit Message

Jonathan Cameron June 14, 2021, 11:34 a.m. UTC 
From: Jonathan Cameron <Jonathan.Cameron@huawei.com>


The bit reversal was wrong for bits 1 and 3 of the 5 bits.
Result is driver failure to probe if you have more than 2 daisy-chained
devices.  Discovered via QEMU based device emulation.

Fixes tag is for when this moved from a macro to a function, but it
was broken before that.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Fixes: 065a7c0b1fec ("Staging: iio: adc: ad7280a.c: Fixed Macro argument reuse")
---
 drivers/staging/iio/adc/ad7280a.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.32.0
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Patch

diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index fef0055b8990..20183b2ea127 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -107,9 +107,9 @@ 
 static unsigned int ad7280a_devaddr(unsigned int addr)
 {
 	return ((addr & 0x1) << 4) |
-	       ((addr & 0x2) << 3) |
+	       ((addr & 0x2) << 2) |
 	       (addr & 0x4) |
-	       ((addr & 0x8) >> 3) |
+	       ((addr & 0x8) >> 2) |
 	       ((addr & 0x10) >> 4);
 }