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iio: DAC: ad5624r_spi: fix bit shift of output data value

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The value sent on the SPI bus is shifted by an erroneous number of bits.
The shift value was already computed in the iio_chan_spec structure and
hence subtracting this argument to 16 yields an erroneous data position
in the SPI stream.

Signed-off-by: JM Friedt <jmfriedt@femto-st.fr>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
JM Friedt 2015-06-19 14:48:06 +02:00 committed by Jonathan Cameron
parent fd1883f07c
commit adfa969850
1 changed files with 2 additions and 2 deletions
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4
drivers/iio/dac/ad5624r_spi.c
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@ -22,7 +22,7 @@
#include "ad5624r.h"
static int ad5624r_spi_write(struct spi_device *spi,
u8 cmd, u8 addr, u16 val, u8 len)
u8 cmd, u8 addr, u16 val, u8 shift)
{
u32 data;
u8 msg[3];
@ -35,7 +35,7 @@ static int ad5624r_spi_write(struct spi_device *spi,
* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
* for the AD5664R, AD5644R, and AD5624R, respectively.
*/
data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift);
msg[0] = data >> 16;
msg[1] = data >> 8;
msg[2] = data;