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]> --- 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; } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
