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staging: iio: adt7316: fix the dac write calculation

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commit 78accaea117c1ae878774974fab91ac4a0b0e2b0 upstream.

The lsb calculation is not masking the correct bits from the user input.
Subtract 1 from (1 << offset) to correctly set up the mask to be applied
to user input.

The lsb register stores its value starting at the bit 7 position.
adt7316_store_DAC() currently assumes the value is at the other end of the
register. Shift the lsb value before storing it in a new variable lsb_reg,
and write this variable to the lsb register.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Fertic 2018-12-22 21:57:43 -07:00 committed by Greg Kroah-Hartman
parent 8b6eca90e5
commit d253ff1a59
1 changed files with 7 additions and 3 deletions
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10
drivers/staging/iio/addac/adt7316.c
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@ -1447,7 +1447,7 @@ static ssize_t adt7316_show_DAC(struct adt7316_chip_info *chip,
static ssize_t adt7316_store_DAC(struct adt7316_chip_info *chip,
int channel, const char *buf, size_t len)
{
u8 msb, lsb, offset;
u8 msb, lsb, lsb_reg, offset;
u16 data;
int ret;
@ -1465,9 +1465,13 @@ static ssize_t adt7316_store_DAC(struct adt7316_chip_info *chip,
return -EINVAL;
if (chip->dac_bits > 8) {
lsb = data & (1 << offset);
lsb = data & ((1 << offset) - 1);
if (chip->dac_bits == 12)
lsb_reg = lsb << ADT7316_DA_12_BIT_LSB_SHIFT;
else
lsb_reg = lsb << ADT7316_DA_10_BIT_LSB_SHIFT;
ret = chip->bus.write(chip->bus.client,
ADT7316_DA_DATA_BASE + channel * 2, lsb);
ADT7316_DA_DATA_BASE + channel * 2, lsb_reg);
if (ret)
return -EIO;
}