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.
Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
drivers/iio/adc/ti_am335x_adc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 8ffe52d..4427e8e 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -145,6 +145,7 @@ 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,
@@ -169,11 +170,14 @@ 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;
+ }
}
am335x_tsc_se_update(adc_dev->mfd_tscadc);
-
+ if (found == false)
+ return -EBUSY;
return IIO_VAL_INT;
}
--
1.7.10.4
--
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