On 05/29/2013 06:09 PM, Sebastian Andrzej Siewior wrote:
> Usually we get all the values we wanted but it is possible, that te ADC
> unit is busy performing the conversation for the HW events. In that case
> -EBUSY is returned and the user may re-call the function.
>
> Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
> ---
> drivers/iio/adc/ti_am335x_adc.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index df2de4c..6a00874 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -161,6 +161,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
> int i;
> unsigned int fifo1count, read;
> u32 step = UINT_MAX;
> + bool found = false;
>
> /*
> * When the sub-system is first enabled,
> @@ -185,10 +186,14 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
> fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
> for (i = 0; i < fifo1count; i++) {
> read = tiadc_readl(adc_dev, REG_FIFO1);
> - if (read >> 16 == step)
> + if (read >> 16 == step) {
> *val = read & 0xfff;
> + found = true;
> + }
> }
> tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB);
> + if (found == false)
> + return -EBUSY;
>
> return IIO_VAL_INT;
> }
>
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