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iio: dac: cio-dac: Fix max DAC write value check for 12-bit 

The CIO-DAC series of devices only supports DAC values up to 12-bit
rather than 16-bit. Trying to write a 16-bit value results in only the
lower 12 bits affecting the DAC output which is not what the user
expects. Instead, adjust the DAC write value check to reject values
larger than 12-bit so that they fail explicitly as invalid for the user.

Fixes: 3b8df5fd52 ("iio: Add IIO support for the Measurement Computing CIO-DAC family")
Cc: stable@vger.kernel.org
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/20230311002248.8548-1-william.gray@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
William Breathitt Gray 2023-03-10 19:22:48 -05:00 committed by Jonathan Cameron
parent 099cc90a5a
commit c3701185ee
1 changed files with 2 additions and 2 deletions
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4
drivers/iio/dac/cio-dac.c
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@ -66,8 +66,8 @@ static int cio_dac_write_raw(struct iio_dev *indio_dev,
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
/* DAC can only accept up to a 16-bit value */
if ((unsigned int)val > 65535)
/* DAC can only accept up to a 12-bit value */
if ((unsigned int)val > 4095)
return -EINVAL;
priv->chan_out_states[chan->channel] = val;