On 10/18/2018 02:55 PM, Dan Carpenter wrote:
> On Thu, Oct 18, 2018 at 12:10:32PM +0300, Stefan Popa wrote:
>> +static int ad7606_read_samples(struct ad7606_state *st)
>> +{
>> + unsigned int num = st->chip_info->num_channels;
>> + u16 *data = st->data;
>> + int ret;
>> +
>> + /*
>> + * The frstdata signal is set to high while and after reading the sample
>> + * of the first channel and low for all other channels. This can be used
>> + * to check that the incoming data is correctly aligned. During normal
>> + * operation the data should never become unaligned, but some glitch or
>> + * electrostatic discharge might cause an extra read or clock cycle.
>> + * Monitoring the frstdata signal allows to recover from such failure
>> + * situations.
>> + */
>> +
>> + if (st->gpio_frstdata) {
>> + ret = st->bops->read_block(st->dev, 1, data);
>> + if (ret)
>> + return ret;
>> +
>> + if (!gpiod_get_value(st->gpio_frstdata)) {
>
> This check should maybe be:
>
> if (gpiod_get_value(st->gpio_frstdata) <= 0) {
>
> (Or possibly not, I don't know the code very well).
gpiod_get_value() is only allowed to return either 0 or 1.
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