staging: iio: adt7316: fix the dac read calculation

The calculation of the current dac value is using the wrong bits of the
dac lsb register. Create two macros to shift the lsb register value into
lsb position, depending on whether the dac is 10 or 12 bit. Initialize
data to 0 so, with an 8 bit dac, the msb register value can be bitwise
ORed with data.

Fixes: 35f6b6b86ede ("staging: iio: new ADT7316/7/8 and ADT7516/7/9 driver")
Signed-off-by: Jeremy Fertic <jeremyfertic@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
index 80cc3420036b14a89a2ec5591380cb259c3fc59b..d7f3d68e525b0f221395cdcf62ca63e00cb2bfca 100644 (file)
--- a/drivers/staging/iio/addac/adt7316.c
+++ b/drivers/staging/iio/addac/adt7316.c
@@ -47,6 +47,8 @@
 #define ADT7516_MSB_AIN3               0xA
 #define ADT7516_MSB_AIN4               0xB
 #define ADT7316_DA_DATA_BASE           0x10
+#define ADT7316_DA_10_BIT_LSB_SHIFT    6
+#define ADT7316_DA_12_BIT_LSB_SHIFT    4
 #define ADT7316_DA_MSB_DATA_REGS       4
 #define ADT7316_LSB_DAC_A              0x10
 #define ADT7316_MSB_DAC_A              0x11
@@ -1392,7 +1394,7 @@ static IIO_DEVICE_ATTR(ex_analog_temp_offset, 0644,
 static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
                                int channel, char *buf)
 {
-       u16 data;
+       u16 data = 0;
        u8 msb, lsb, offset;
        int ret;
 
@@ -1417,7 +1419,11 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
        if (ret)
                return -EIO;
 
-       data = (msb << offset) + (lsb & ((1 << offset) - 1));
+       if (chip->dac_bits == 12)
+               data = lsb >> ADT7316_DA_12_BIT_LSB_SHIFT;
+       else if (chip->dac_bits == 10)
+               data = lsb >> ADT7316_DA_10_BIT_LSB_SHIFT;
+       data |= msb << offset;
 
        return sprintf(buf, "%d\n", data);
 }